N=72 (6 years times 12 periods per year)
I= 8/12 (8% annual/12 months/year)
PV=0
PMT= Solve (solving for payment because its amount each period)
FV= 40,000
Can either use the formula using these values but easier to do the inputs in financial calculator or on excel.
Compute Payment you get $434.66. As a result you must deposit $434.66