If the cost of 21 articles …
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Posted by Vatsala Sharma 5 years, 1 month ago
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Yogita Ingle 5 years, 1 month ago
CP of 21 articles=x
CP of 1 article=x/21
SP of 18 articles=x
SP of 1 article=x/18
since x/21 <x/18, there is a gain
gain=SP-CP
=x/18-x/21
=(7x-6x)/126
=x/126
gain%=gain/CP×100
=(x/126÷x/21)×100
=(x/126×21/x)×100
=100/6
=50/3
=16 2/3%
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