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Solutions
The correct answer is option 4 i.e. 21.
Gain% = {(S.P - C.P) × 100}/C.P
Gain%/100 = Profit/C.P
SP of n article = CP of 35 article
CP/SP = n/35
Gain% = 66.66% = 200/3
Gain%/100 = 200/300 = 2/3
2/3 = Profit/CP
SP/CP = 5/3 = 35/n
⇒ 5 × n = 35 × 3
⇒ n = 21
So, n = 21