# Simple Interest Question?

Please I need help with this question

Martha lent Aaron money 3 years ago at a simple interest rate of 14%. He repaid her in full plus interest of $399. How much did she lend him 3 years ago?

-Thanks

### 2 Answers

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- Anonymous9 years agoBest Answer
P = principal

I = interest earned annually

Want P + 3I = 399

Also, we know that I = 0.14P

So, P + 3(0.14)P = 399

1.42 P = 399

P = 399 / 1.42 <---- amount loaned 3 years ago

- Anonymous9 years ago
Oh my goodness. I'm completely blanking. I just learned this 2 months ago in math class. Damn, if my Math teacher was here, he would be yelling at me. Sorry.

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