Payday loans are very short-term loans that charge very high interest rates. You can borrow $900 today and repay $950 in two weeks. What is the compound annual rate implied by this percent rate charged for only two weeks?

Payday loans are very short-term loans that charge very high interest rates. Lets say you can borrow $500 today and repay the original $500 plus a $30 loan fee (interest charge) in 10 days. What is the compound annual interest rate implied.