Define by the formula:
S =D [ (1+r)^n -1 ] /r
S - what need at the end, 10,000
D - the monthly deposit (divide it by four for weekly)
n - the number of compounding periods, 5*12 = 60
r - the interest rate (decimal) at each compounding period, 0.12/12 = 0.01
so
10,000 = D[ 1.01)^60 -1 ] / 0.01
10,000 = D (0.817)/0.01 = D (81.7)
D = $122.44 per month
D/4 = $30.61 per week
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