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What is the correct answer?
4
A towel, when bleached, was found to have lost 20% of its length and 10% of its breadth. The percentage of decrease in area is ?
A.
27%
B.
28%
C.
29%
D.
30%
Correct Answer :
B. 28%
Let original length = x
and original width = y
Decrease in area will be
=
x
y
-
80
x
100
×
90
y
100
=
x
y
-
18
25
x
y
=
7
25
x
y
D
e
c
r
e
a
s
e
=
7
x
y
25
x
y
×
100
%
=
28
%
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