Dr Pooranmal and Ashfaq A Khan Solutions for Chapter: Simple Interest, Exercise 1: EXERCISE 15.1

What sum of money lent out at $6.25\%$ per annum simple interest produces $₹43.75$ as interest in $8$ months?

At what rate percent per annum will a sum triple itself in $16$ years.

At what time will a sum of money put at $12\%$ simple interest treble itself?

If a sum of money at simple interest doubles itself in $8\text{ years}$, find the rate percent per annum?

A sum of money doubles itself in $6\text{ years}$. In how many years will it treble itself at the same rate of simple interest?

What capital will a person earn a monthly interest of $₹20$ at $6$ paise per rupee per year simple interest?

The simple interest on a sum of money for $3$ years is $₹960$ and for another period at the same rate of interest is $₹1,600$. How long is the second period in years?

Jamna Das borrowed $₹12,650$ from the Mukhia of the village at $18\%$ per annum. After $3$ years, he paid $₹10,381$ and gave a buffalo to clear the debt. What is the cost of the buffalo?