Isaac made a mistake in his checkbook. He wrote a check for $8.98
to rent a video game but mistakenly recorded in his checkbook as an $8.98 deposit. Represent each transaction with a rational number, and explain the difference between the transactions.

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?