What amount 18 months ago is equivalent to $2300, 1.5 year from now if money earn 7% compounded monthly during the interving time?

Question

i know: FV=$2300 j=7% m=12 and ?n=36?
i=7%/12
PV=FV(1+i)^-n
PV=2300(1+.07/12)^-36
PV=1865.48
The answer is $1865.45

What i don't understand is how do we get the "n=36"...plz help!!!

Answer 1

18 months + 1.5 years = 36 months

Answer 2

thnx :D!!!

but im confuse because isnt n= mt
m=12
t= 18months?