Question

A vendor bought 4 dozen eggs at rs 4 each 7 of these were broken at what price per dozen should he sell the remaining eggs so as to gain 10 percent on the whole

Answer 1

C.P of egg = 4×12×4=192 rupee
10 % of 192 = 192×10\100=19.2
now for 10% gain S.P of total egg = 192+19.2=211.2

Answer 2

Dozen=12

price of each egg=Rs 4 

Total price=4*12*4

               =Rs 192

Seven were broken=4*7

                              =21

192-21=171

To gain 10% profit he should sell them at rate of

              192*110/100=211.2

12*4=Total eggs=48

Present no. of eggs=48-7=41

To gain Rs 211.2 he should sell each egg at rate of 211.2/41=Rs 5.15

Hope this helps!