18. 2 e mr. C is no year old now. mr. c wonts to invest a certain amount of amount of money at the beginning of every month into a porsion find for 25 (until age 60 ). The first payment is made now. mr.c wants to receive 3.000 TL at the end of every month as an ordinary annuity for years beginning two month after he makes the last payment. How much des he have to invest money month for 25 years? at the beginning of each