Question

please answer it as much as possible.

BEST ANSWER WILL BE MARKED AS A BRAINLIEST ANSWER.

NO answer from the internet.

Answer 1

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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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Answer 2

Let the CP of 1 article be 1 rs
Then, CP of 21 article = 21 rs
Given,
CP of 21 article = SP of 18 article .
hence, the SP of 18 article = 21 rs
SP of 1 article = 21/18
Gain% = (gain / CP× 100)%
Gain = 21-18 = 3
CP = 18
= 3/18×100
= 300/18
= 50/3
Hence the required answer is 16 whole 2/3%