Rebecca is investing $10,000 of her earnings into a savings account that pays r percent simple annual interest. If Rebecca pulls her money out after n years, how much interest will she have earned on her investment?

`10,000x^n`

`10,000(x/100)^n`

`10,000n(x/100)`

`10,000(1+x/100)^n`

`10,000(n(x/100)+1)`