Staples scientific calculator BD-107i
To find percentages on this calculator, or any calculator, you divide one number by the other, and multiply the result by 100.
For example, for 2 out of 5, we type in 2, hit the divide button, type in 5 and hit the equals sign and we will get 0.4. To make this into percentage, we then multiply the answer by 100 to get 40%.
Good luck,
Paul