Question

a bands length is 72 CM when it is stretched it becomes 90 cm find its percentage increase ​

Answer 1

band length is 72 cm=initial length

final length after strecting=90cm

now change in length =90-72

=18cm

percentage increase is =( 18/72)*100

= 25%

so right ans is 25%

Answer 2

Answer:

25%

Step-by-step explanation:

$Increase\;percent=\frac{Change\;in\;value}{Original\:value}$

Change in value = 90 - 72

⇒ 18 cm

Original value = 72 cm

⇒$\frac{18}{72}\times 100$

⇒ $\frac{1}{4}\times100$

⇒ 25

⇒ 25% is the increase.

∴ The length of the band is increased by 25%