I had a long day at work, but i still can’t believe that i’m getting stuck in this chapter. Please help 
Jamie Morgan needs to accumulate $2,000 in 18 months. If she can earn 6% at the bank, compounded quarterly, how much must she deposit today? A) $1,832.61. B) $1,829.08. C) $1,840.45. Your answer: A was incorrect. The correct answer was B) $1,829.08. Each quarter of a year is comprised of 3 months thus N = 18 / 3 = 6; I/Y = 6 / 4 = 1.5; PMT = 0; FV = 2,000; CPT → PV = $1,829.08. I’ve always divided N by 4 for all the questions with “compounded quarterly,” why are we dividing it by 3 here? How is this question different from other questions where you just divide it by 4??? Thank you!!
18 months… 1 quarter == 3months… divide by 4 works when you are given YEARS…