Suppose that the parents of a young child decide to make semi-annual deposits into a savings account, with the first deposit being made on the child's 5thbirthday and the least deposit being made on the 15th birthday. Then starting on the child's 18th birthday, withdrawals of P5,000 and an increasing of 10% every semi-annual will be made until his 21 stbirthday. If the nominal interest rate is 15% compounded quarterly, what are the semiannual deposits. (Hint: Be careful in counting n-periods)