SIPage

Problem $(5)$: Suppose that the parents of a young child decide to make annual deposits into a saving account, with the first deposit being made on the child's Sth birthday and the last deposit being made on the $15$th birthday. Then, starting on the child's $18$ th birthday, the withdrawals $($ $$2000$ in the $18$ th birthday, $$2400$ in the $19$ th birthday, $$2800$ in the $20$ th birthday, and $$3200$ in the $21$ st birthday$).$ If the annual interest rate is $10\%$ during this period of time, what are the annual deposits in years $5$ through $15?$

$($Bonus$)$

Solution: