COMPOUND INTEREST CUMULATIVE AMOUNT

Fixed deposit calculations can be done by both manual and automatic methods.Now let us figure out the fd calculation in both ways:
1.) Manual Calculation Technique: It is the conventional process to know your Fixed deposit interest calculation. The formula for manual fd calculation is used as below:

Where,A = Final Amount
P = Principal Amount (initial investment)
r = Annual Nominal Interest Rate (as a decimal, not in percentage)
n = Number of times the interest is compounded per year
t = Number of years

2.) Online Calculator Technique: Nowadays online FD calculator is very amazing technique and it is a very useful online tool that helps you to easily calculate your Fixed deposit return. Online FD calculators uses simple technique in which you need to put your amount, tenure, interest rate and can get accurate results instantly. You can easily calculate and compare the interest receivable by changing the deposit amount.

premium X % X time
so 380,00000 X4/100 X 1 year
it calculated as the amount ( premium ) multiplied by the percentage of 100 multiplied by the period in years or parts of a year
so it can be 100 X 25% or 1/4(25/100) by the period (5 years or daily (1/365 of a year)
This is known as simple interest
compound interest is calculated on remaining premium after payment X the interest rate by the day or week or month
so for example 100 X 4/100 X 1/12 is the first calculation for the month and for the next month the calculation will be premium of 80 ( if a 20 payment was made in the month X 4/100 X 1/12 and so on if payment are made on time
pm the other hand if no payment are made then the premium goes up by the interest rate
so for the next month it is 104 X 4/100 X 1/12 and the month after that 108.16 X 4/100 X 1/12.and so on
banks use compound when calculating home loan repayments and simple interest when paying interest on your deposits
( has to be in the bank for 367 days to get the interest paid )

interest is interest
fixed is calculated yearly on the principle and is paid 365 days time
variable changes and is calculated daily ( 1/365 part of the interest rate ) and added to the remaining principle monthly
so if you have a loan of $1000.00 on fixed interest of 10% , regardless of how much you have repaid in a 12 month period , it is 10% of the principle loaned
with a variable interest the interest rate could be 10% today, 15% in 2 months time or 6% later on
it is variable
to add to that it is calculated on a daily basis (1/365 of 10%) and added to the principle left after receiving a payment on the loan
so for a $1000.00 the interest is added to that principle at the end of the month if there is no loan repayment or is added to the principle balance after a payment
the difference is that a variable interest rate loan will allow you to save money if you pay off well before the period of the loan but will add almost 2 to 3 times the loan if you pay the absolute minimum for the period of the loan
a fixed rate is where you know exactly the total interest to be paid at the end of term

That question is much more complicated than you think - are you charging interest percentage daily? Weekly? Monthly? Anually? Once you have the period figured, you begin at some start point of your choosing. Exactly one "period" later, you multiply the basis (the outstanding balance) by the percentage rate (5%, for example, would mean you multiply by 0.05), then add that number to the basis - that's your new basis, your new outstanding balance.

But... if you charge an annual interest rate, and you compound daily or weekly or monthly, you have to take payments into account and adjust for them - it's fair to charge interest up to the moment of payment, but not beyond that moment; you can rightly only charge interest on the remaining unpaid balance beyond that date.

If you charge an annual interest rate but compound monthly, then every month you'd charge 1/12 of your annual interest rate. If weekly, 1/52. If daily, 1/365. The smaller the compounding period, the easier it is to calculate interest around payments, but the more paperwork is involved.

If the interest is compounded monthly:

2nd [CLR TVM] (clear any existing results)
1 5 0 0 0 _/- PV (present value, negative because you're paying it out)
6 I/Y (annual interest rate)
25 2nd [*P/Y] N (25 years)
CPT FV (compute future value, see 66,974.55)

If the interest is compounded annually:

2nd [CLR TVM] (clear any existing results)
1 5 0 0 0 _/- PV (present value, negative because you're paying it out)
6 I/Y (annual interest rate)
2nd [P/Y] 1 ENTER 2nd [QUIT] (one compounding period per year)
25 N (25 years)
CPT FV (compute future value, see 64,378.96)

$276,000 which would be $23,000 per month assuming annual compounding.

Recurring deposit interest is calculation may vary depends on compounding period. You have to invest an amount every month interest will be calculated for the current holding in your recurring deposit account. And every compounding period interest amount will be added into holdings or available balance. You can calculate the Recurring deposit using this recurring deposit calculator

=10000*(1+0.96)^12
=10000*(1+0.10)^18
=10000*(1+0.10)^24

Try the FV function Syntax
FV(rate,nper,pmt,pv,type)