Question

Cost of 15 notebooks is equal to selling price of 12 notebooks .find the gain or loss percentage

Answer 1

let cost price of 1 note book = x

so cost price of 15 note book = 15x

given that

Sales Price of 12 note book = cost price of 15 note book = 15x

so sales price of 1 note book = 15x/12 = 5x/4

gain %

= (sales price of 1 note book - cost price of 1 note book ) / cost price of 1 note book × 100

⇒ ((5x/4 - x)/x ) × 100 = (1/4 ) × 100 = 25%

Hence gain %  = 25%