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Sagot :
The amount of money that he should have at the closing of December should be $235.96
How to find total savings
Given that,
- Starting amount = $24
And, it plans to save 10% more as compared to the last month.
June =$24
July =24 + 2.4 = $26.4
August = 26.4 + 2.64 =$29.04
September = 29.04 + 2?904 = $31.944
October =31.944 + 3.1944 =$35.0984
November =35.0984 + 3.50984 =$42.60824
December = 42.60824 + 4.260824 =$46.869064
Total savings = 24 + 26.4 + 29.04 + 31.944 + 35.0984 + 42.60824 + 46.869064
= $235.959704
Approximately, $235.96
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Answer:
(c) $227.69
Step-by-step explanation:
The amounts Cory will be adding to his account comprise a geometric series with first term $24 and each successive term 10% more, or 1.10 times the previous term. The total amount Cory will have saved by the end of December is the sum of 7 terms of the series.
__
sum of geometric series
The sum of ...
24 +1.10×24 +1.10²×24 +... +1.10⁶×24
is given by the formula ...
Sn = a1×(r^n -1)/(r -1)
where a1 is the first term (24), and r is the common ratio (1.10).
formula application
For the series representing Cory's deposits, we have ...
S7 = 24×(1.10^7 -1)/(1.10 -1) = 24×0.948717/0.10 ≈ 227.69
At the end of December, Cory will have about $227.69.
_____
Additional comment
A financial calculator or app can also tell you the value of an annuity with a 10% increase per period.
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