Multiple Choice Questions

A number is increased by 20 and then decreased by 20 the final value of the number is ........

Quantitative Aptitude (RRB NTPC) Percentage

A number is increased by 20% and then decreased by 20%, the final value of the number is ?

increased by 2%

decreased by 2%

decreased by 4%

increased by 4%

Here, x = 20 and y = - 20
Therefore, the net % change in value
=x + y + xy /100 %
= 20 + (−20) + 20×(−20) /100% or - 4%

Since the sign is negative, there is a decrease in value by 4%.

Hence, option 3 is the correct asnwer.

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