Question

A number is increased by 20% and then it is decreased by 30%

Answer 1

Answer:

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Step-by-step explanation:

The answer is 4% .

Let the number be x.

1st step : It is increasedd by 20% .

Amount if increase = (20/100)*x

THerefore,the number now after increase = Previous value+amount increased

=x+(20/100)*x =(120/100) *x

2nd step: The resultant number is again decreased by 20% .

Amount decreased= (20/100)*(120/100)*x = 24x/100

The number now = (120/100) x- (24/100)x =96x/100

Now the original number was x and now it is 96x/100.

so net decrease = x-96x/100

Percentage decrease =(net decrease/ original value)* 100

=4%

Answer 2

Answer:

let the no be 100.

20% of 100 =120

30% of 120 will be

30/100*120

$30 \div 100 \times 120$

=36