Question

the cost price of 18 chairs be equal to the selling price of 16 chairs find the gain or loss percent

Answer 1

$2 \div 18 \times 100 = 100 \div 9 = 11 + 1 \div 9\%$
11+1÷9%

Answer 2

let the cost price of one chair is x rs

so cost of 18 chairs = 18x

selling price of 16 chairs = 18x

so selling price of 1 chair is = 18x /16

= 9x /8

cost price x rs
selling price 9x /8 rs

so profit = 9x /8 - x

= 9x - 8x /8

profit = x /8 rs

x rs cost -------- x/8 profit

100 rs cost ---------- ?

profit percentage = 12.5 %



-------- method 2 --------


18 - 16 = 2

cost 16 ----- profit 2

cost 100 ----- profit ???

profit percentage = 100 × 2 /16

= 200/16

= 12.5 %