Question

tra number is first increased by 10% and then decreased by 10%, then the net increase or decrease
percentage is?​

Answer 1

Answer:

If the number is 100 , when it increase by 10%, it become 110. When 110 is decreased by 10%, its value is 110 x (90 ÷ 100) = 99. Net decrease is 1%.

Answer 2

Let the number be 100

when increased by 10% number will be

$\longrightarrow \tt \:100 + \frac{10}{100} \times 100 = 110$

when decreased by 10%

$\longrightarrow \tt \:110 - \frac{10}{100} \times 110 = 99$

Decrease in original value is (100-99)=1

Percentage decrease is

$\longrightarrow \tt\frac{1}{100} \times 100 = 1$

There will be 1 percent decrease.