Question

The cost of 21 articles is equal to the selling price of 18 articles. The gain per cent is .........

Answer 1

Step-by-step explanation:

let CP of 1 article be x

SP of 18 articles = 21x

SP of 1 article = 21x/18 = 7x/6

Profit = SP-CP

= 7x/6-x

= (7x-6x)/6

= x/6

Profit% = (Profit × 100)÷CP = x/6×1/x × 100 = 100/6 = 50/3 = 16.6%

Profit is 50/3% or 16.6%