onelife1

It’s a basic TVM calculation.  Make sure you have P/Y = 1 in your calculator, and clear your calculator.
N = 20
I/Y = 6
PV = ???
PMT = -13,544.68
FV = zero
Enter the keystrokes, and hit CPT PV, and you get $155,356.4125.
(BTW–I didn’t look at the problem.  I’m just going by your information.)