Question

Nandlal bought 20 dozen notebooks at RS.156 per dozen. He sold 8 dozens of them at 10% gain and the remaining 12 dozens at 20% gain. What is his gain percent in the whole transaction?​

Answer 1

profit of 8 dozen = 156×8×(10/100)

= 124.8

S.P of 8 dozen = 1248 + 124.8

= 1372.8

S.P of 12 dozen = 156 ×12 (120/100)

= 2246.4

S.P(8) + S.P(12) = 1372.8+2246.4

=3619.2

C.P = 156×20

= 3120

$profit\ \: \% = \frac{(3619.2 - 3120) \times 100}{3120}$

profit = 16%