I need formulas and explanation)

XYZ Corporation borrowed $150,000 for six months from the bank. The rate is prime plus 2 percent. The prime rate was 8.5 percent at the beginning of the loan and changed to 9 percent after two months. This was the only change. How much interest must XYZ corporation pay? a) How much interest must XYZ corporation pay if interest compounds with every change in prime interest rate? b) How much interest must XYZ corporation pay if interest does not compound with every change in prime interest rate