assistance with a) & c) (skip b)

(a) (b) Sam invests R28 000 for two years ands earns 4,7% per annum compound interest. (1) (2) He leaves the money in the account for a further two years. The interest rate Calculate the accumulated value at the end of the two-year period. changes to 6% per annum simple interest. How much money will he then have saved? What amount must Tanisha invest now if she wishes to accumulate RI 000 000 in years' time given that the interest rate is: (1) 13% per annum simple interest? (2) Theresa believes that she has the potential to double her money in three years by 13% per annum compound interest? investing in the share market. If she deposits R60 000 into a share-market investment account, (1) what simple interest rate will be required in order for her to do this? (2) what compound interest rate will be required in order for her to do this? (0)