Q. 145.0( 4 Votes )
The ratio of cost A. 5%
B. 5 
%
C. 6%
D. 6
%
Answer :
Let × be the common multiple
CP = 20x
SP = 21x
Gain = SP – CP
= 21 × – 20x
= x
Gain Percent = 
= 5%
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