Sophie made equal deposits at the beginning of every 3 months into an RRSP. At the end of 6 years, the fund had an accumulated value of $40,000. If the RRSP was earning 3.25% compounded monthly, what was the size of the quarterly deposits?
first we have to calculate quarterly rate for monthly compounding
EAR = (1+(r/n))^n - 1
r = annual rate
n = compounding periods
let ' x' be quarterly rate
(1 + (3.25%/12))^12 - 1 = (1 + x)^4 - 1
quarterly rate(x) = 0.815%
future value of annuity due = P*[(1+r)^n - 1 / r ]*(1+r)
where P = quarterly deposits
r = rate of interest per quarter = 0.815%
n = number of quarters = 6*4 = 24
40,000 = P*[(1+0.815%)^24 - 1 / 0.815% ]
P = $1503.54
Quarterly deposits = $1503.54
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