please answer quickly

Anne's Dress Shop borrowed $3,200 to buy material. The loan was paid off seven months later by a lump-sum payment that included $168 interest. What was the simple rate of interest at which the money was borrowed? Report your answer with 0 decimal places. A loan of $880 can be repaid in 15 months by paying the principal sum borrowed plus $104.50 interest. What was the rate of interest charged? Report your answer to 1 decimal place