A shopkeeper bought 24 chairs at the rate of Rs 450 per chair. He sold 16 of them at the rate of Rs 600 per chair and the remaining at the rate of Rs 400 per chair. Find his gain or loss percent.Please give steps.​

18.51%

total chairs =24

total cost price = 24 x 450 =10800 RS

selling price of 16 chairs = 16 x 600 = 9600 RS

now remaining chairs = 24 - 16 = 8

cost of remaining chairs = 400 x 8 = 3200

total selling price= 9600+3200= 12800

there fore he had profit

profit = selling price-cost price

= 12800-10800=2000rs

profit percentage= profit x 100 ÷ cost price

= 18.51%