Editorial Board Solutions for Chapter: Arithmetic Maths, Exercise 1: SIMPLE & COMPOUND INTEREST

Rs. $1500$ are divided into two parts such that if one part is invested at $6$ $\%$ and the other at $5$ $\%$ the whole annual interest from both the sum be Rs. $85$. How much lent at $5$ $\%$?

The simple interest on a sum of money is $\frac{4}{9}$ of the principal and the number of years is equal to the rate percent. Find the rate and the time.

In what time will Rs. $4000$ lent at $3$$\%$ annum on simple interest earn as much interest as Rs. $5000$ will earn in $5$ years at $4$$\%$ per annum on simple interest.

In how many years will a sum money doubles itself at $5$$\%$ per annum simple interest.

A sum of money becomes triple itself in $5$ years at simple interest. In how many years will it become six-time at the same rate? 

A sum of money becomes double itself in $8$ years at simple interest. How many times will it become in $10$ years at the same rate?

A part certain sum of money is invested at $9\%$ per annum and the rest at $12\%$ per annum. If the interest earned in each case for the same period is equal. Then the ratio of the sums invested is:

The equal amounts of money are deposited in two banks each $15$$\%$ per annum for $3.5$ years and $5$ years respectively. If the difference between their interest is $₹144$. Find the sum?