Instruction
1
Install the mouse cursor on the desktop and press the right button. Choose "create" and then "Microsoft Excel".
2
Open a spreadsheet and create three columns:

A - number;

In percentage;

With the result.
3
The first two columns fill with data at its discretion, and the third Express until empty.
4
Select the third cell is a "result" and enter the formula "=A2*B2%" and press Enter.
5
In the column "result" will appear a number that shows the value of the interest.