The chart below shows one store's sales of computers, listed by model.
if the changes in sales between may and june continue at the same rate, how many total computers will be sold in july?
a 534
b. 721
c 1,019
d. 1.254

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?