3. Ahmad bought a set of sofa and paid RM200 as a down payment. The balance was to bepaid by monthly payments of RM150 for two years. The interest rate was charged 10% perannum based on the original...

3. Ahmad bought a set of sofa and paid RM200 as a down payment. The balance was to be paid by monthly payments of RM150 for two years. The interest rate was charged 10% per annum based on the original balance. No use excel. Find: a) the amount of the loan. (RM3000) b) the cash price. (RM3200) c) the amount he has to pay immediately after the 20th payment, if he decides to settle all the outstanding debts. Use the Rule of 78. (RM580)