Question

Find % of increase or decrease.
1. Price of shirt decreased from rs. 280 to rs.210
2. Marks in a test increased from 20 to 30

Answer 1

1. initial price of shirt=280

new price= 210..

change in price= 280-210= 70..

percentage decrease=

$\frac{70}{280} \times 100 = 25$

so percentage decrease is 25%

2. intial marks.. 20

new marks... 30

change in marks 30-20=10

percentage change..=

$\frac{10}{20} \times 100 = 50$

percentage increase is 50%