Question

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 ${30}^{th}$ instalment.

Answer 1

$A.P.$ with the first term = $100$ and common difference = $5$.

${30}^{th}=a+(n-1)d$

$⟹100+(30-1)5$

$⟹100+29\times 5$

$|implies100+145$

$⟹245$