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A man accepts a position with an initial...

A man accepts a position with an initial salary of Rs. 5200 per month. It is understood that the will receive an automatic increase of Rs. 320 in the very next month and each month thereafter. Find his salary for the tenth month What is his total earnings during the first year?

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We have,
The initial salary m, a_1=Rs.5200
The salary of the second month,
`a_2=Rs.5200+Rs.320=Rs.5520`
The salary of the third month, `a_3=Rs.5520+Rs.320=Rs.5840`
...
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