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My understanding is that it should be:
PV = $120,000 (money PUT IN account)
PMT = $8,000 (money GOING IN account)
N = 30 (number of years)
FV = -$1,500,000 (money COMING OUT of account at the end, or a final ‘payment’)
Alternatively, you could view it this way:
PV = -$120,000 (money LEAVING PERSON to go into RRSP)
PMT = -$8,000 (money LEAVING PERSON to go into RRSP)
N = 30 (number of years)
FV = $1,500,000 (money RETURNING TO PERSON from RRSP)