please help

1.1 Determine the nominal interest rate if the investment received roli p.a. compounded monthly whereas eftectively it receives 8.3% per annum. 1.2 Mpho takes a loan of 400000 at an interest rate of 11% p.a. compounded monthly. Mpho must amortise (pay off) the loan within 5 years with equal monthly repayments starting in one month's time. If he pays the loan over 5 years, his calculations gave him the monthly payments amoutting to R8 696.97. 1.2.1 Determine the amount of interest Mpho would pay if he were to sign this agreement. 1.2.2 How many full monthly repayments would Mpho pay if he were to increase the monthly payments by 303,03 ? 1.2.3 What is the vulue of Mpho's final payment? 1.2.4 How much interest will he save based on the decision he took in 1.2.2? [14]