(Solving for r of an annuity) You lend a friend $45,000, which your friend will repay in 7 equal annual end-of-year payments of $10,000, with the first payment to be received 1 year from now. What rate of return does your loan receive? The rate of return your loan will receive is %. (Round to two decimal places.) (Solving for r in compound interest) You lend a friend $19,000, for which your friend will repay you $42,000 at the end of 6 years What interest rate are you charging your friend? The interest rate you are charging your friend is % (Round to two decimal places.)