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Find the interest rate (or rates of return) in each of the following situations. Do not round intermediate calculations. Round your answers to the nearest a. You borrow $720 and promise to pay back $792 at the end of 1 year. % b. You lend $720 and receive a promise to be paid $792 at the end 1 year. % c. You borrow, $75,000 and promise to pay back $149,926 at the end of 9 years. % d. You borrow $8,000 and promise to make payments of $2,219.30 at the end of each of the next 5 years. %