17. A man starts repaying a loan as first instalment of Rs. 100. If he increases the instalment by Rs 5 every month, what amount he will pay in the 30th instalment?
The first instalment is of Rs. 100.
If the instalment increase by Rs 5 every month, second instalment is Rs.105.
Then , it forms an AP.
We have ,
Thus, he will pay Rs. 245 in the 30th instalment.
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