how do i solve this?

Derek plans to retire on his 65 th birthday. However, he plans to work part-time until he turns 72.00. During these years of part-time work, he will neither make deposits to nor take withdrawals from his retirement account. Exactly one year after the day he tms 72.0 when he fully retires, he will begin to make annual withdrawals of $160,137.00 from his. retirement account until he turns 92.00. He he will make contributions to his retirement account from his 26 th birthday to his 65 th birthday. To reach his goal, what must the contributions be? Assume a 9.00% interest rate