Question

. The pollution levels in a city reduced by 10%. Two
months later, the pollution level further decreased by
10%. What is the net decrease in the pollution level?​

Answer 1

Answer:

let the pollution level before decrease be 100.

after 1st decrease,

= 100-10%of 100

=90

after two months,

=90-10%of90

=81

thus, after both decreases the pollution level will be 81.

decrease=100-81=19

decrease%= 19/100×100 = 19%

thus, the net decrease in pollution level is 19%

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