A mail 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 `30^(t h)`instalment?

Explanation

Above question can be solved using Arithmatic progression.

Here, `a_1 = 100, d = 5 and n=30`

Then, 30th term`(a_30) = a_1+(n-1)d`

`=100+5**29 = 245`

So, he has to pay Rs `245 ` in `30th` installment.