A positive number x was multiplied by 0.5 The product was divided by 3. Then, the result was squared and 1 was added to it. The final result was 50. What was the value of number x? *

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?