You want your savings to double in a decade. a. Explain why 7.2% interest a year would

Question:

You want your savings to double in a decade.
a. Explain why 7.2% interest a year would do this.
b. You might think that 10% interest a year would give 100% interest (that is, double your savings) over a decade. Explain why interest of 10% a year would actually cause your savings to multiply by 2.59 over a decade.