In measuring the sides of a rectangle, one side is taken 20% in excess and the other 10% in deficit. Find the error per cent in area calculated from the measurement ?
Correct Answer: 8% excess
Explanation:
Since Area of Rectangle = side1 x side2
Therefore, error% in area
=
%
= [20 - 10 + ( -10 x 20)/100]% or 8%
i.e. 8% excess.
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