Problems on Percentage

Problems on Percentage

Example 1

Shweta is a very expert in bargaining. Once she went to a nearby shop. When shweta asked the price of shampoo sachet the shopkeeper told her the price by increasing 15% of the original cost. But shweta insisted to decrease the price by 15% so the shopkeeper sold it by decreasing the price by 15% what is the loss or profit of shopkeeper and by how much percent?

Solution:

Let the actual price be 100

100 ---(+15%)-----> 115----(-15%)--------> 97.75

loss of 2.25%

Example 2

If the length and breadth of a rectangle are changed by +20% and -10% what percentage change in area of rectangle?

Solution:

l x b = area

1 x 1 = 1

1.2 x 0.9 = 1.08

so there is 8% increase in the area of rectangle.

Example 3

The salary of A is 20% lower than B's salary and the salary of C is 56.25% greater than A's salary. By how much percent the salary of B is less than the salary of C.

Solution:

A                          B                               C

80<----(-25%)------------100                           125

------------------(+56.25%)------------------------->

the required value = 25/125 x 100  = 20%