Julián saved R900\displaystyle {R}{900} during the first month of his working life. In each subsequent month, he saved 5%\displaystyle {5}\% more than what he had saved in the previous month.

What amount did he save during the fifteenth month?

Formula

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Stocktake

Type in the list of known variables, example x=1,y=2...:

 

Substitute

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Solve

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(3)

 

(b) How much did he save all together in his first 21 working months?

Formula

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Stocktake

Type in the list of known variables, example x=1,y=2...:

 

Substitute

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Solve

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(3)

 

(c) In which month of his working life was his total savings more than R56000\displaystyle {R}{56000}, for the first time?

Formula

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Stocktake

Type in the list of known variables, example x=1,y=2...:

 

Substitute

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Solve

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That means after months Julián's total saving will be more than R56000\displaystyle {R}{56000} for the first time.

(4)

[10]

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