CTET 2 Math and Science 3 Jan 2022 Paper

Question : 40 of 150

Marks: +1, -0

A number is first increased by 10% and then decreased by 10%. Then the number

Solution:

\;\text " Net change "\;=\;\text " Increment "\; \%-\;\text " Decrement "\; \%-\;{\;\text " Increment "\; × \;\text " Decrement "\;}/{100}

⇒ \;\text " Net change "\;=10-10-\;{10 × 10}/{100}

⇒ \;\text " Net change "\;=-1 \%

∴

A number is first increased by

10 \%

and then decreased by

10 \%

. Then the number will be decreased by

1 \%

The correct option is 3 i.e. is decreased by

1 \%

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