A restaurant is considering purchasing the lot adjacent to its business to provide adequate parking space for its customers. The restaurant needs to borrow $44,000 to secure the lot. A deal has been made between a local bank and the restaurant such that the restaurant would pay the loan back over a five‐year period with the following payment terms: 15%, 20%, 25%, 30%, and 35% of the initial loan at the end of the first, second, third, fourth, and fifth years, respectively. 

(a) What rate of interest is the bank earning from this loan transaction?
(b) What would be the total interest paid by the restaurant over the five‐year period?