Tupac Shakur is saving up for his retirement in sunny California! He has decided to make $3,000 end of month deposits into his 8.4% compounded quarterly investment account. At retirement, he wants to receive $30,000 quarterly payments in advance (so beginning of the quarter) for 12 years. If the interest rate remains the same for the entire question, determine: (5 marks) 

a) How much money he needs at retirement, that will sustain the $30,000 payments. 

b) How long (in years) before he can retire and start receiving his payments of the $30,000?