Question

If a number decreases from 20 to 15, then the decrease is 25%

Answer 1

Answer:

2% is the answer

Step-by-step explanation:

Suppose that:

The number to be 100

According to given question,

Number increased by 20%

100+20% of 100

100=

100

20

×100

100+20=120

Then,

Resulting number decreased by its 15%

=120−(15% of 120)

=120−(

100

15

×120)

=120−18

=102

Now, net increase =102−100=2

Increase %=

original number

net increases

×100

=

100

2

×100

Increase %=2%

Hence this is the answer

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Answer 2

Step-by-step explanation:

Suppose that:

The number to be 100

According to given question,

Number increased by 20%

100+20% of 100

100=

100

20

×100

100+20=120

Then,

Resulting number decreased by its 15%

=120−(15% of 120)

=120−(

100

15

×120)

=120−18

=102

Now, net increase =102−100=2

Increase %=

original number

net increases

×100

=

100

2

×100

Increase %=2%