NCHMCT JEE 2016 Question Paper with solutions for online practice

Question : 11 of 200

Marks: +1, -0

In measuring the sides of a rectangle, one side is taken 5% in excess, and the other 4% in deficit. Find the error per cent in the area calculated from these measurements.

1%
0.9%
0.8%
0.85%

Validate

Solution:

Since Length of rectangle increase 5%
and breadth of rectangle decrease 4%
∴ Area increase by

(x+y+{xy}/{100})

%
=

(5-4-{5×4}/{100})

%
=

(1-1/5)

%
=

4/5

%
= 0.8 %

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