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  1. In measuring the sides of a rectangle, there is an excess of 5% on one side and 2% deficit on the other. Then the error percent in the area is
    1. 3·3%
    2. 3·0%
    3. 2·9%
    4. 2·7%
Correct Option: C

Using Rule 10,

Required percentage =x + y +
xy
%
100

Negative sign for decrease =5 - 2 -
5 × 2
% = 2.9%
100


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