Question

A girl bought eggs at 8.4 rupees a dozen.At what price per hundred must she sell them so as to earn profit of 15 per cent?

Answer 1

first find the price of each egg so ,
in one dozen of eggs consisted of 12 eggs and
the price of one dozen( given ) RS=8.4
12/8.4=1.42 approx
then, the price of hundred eggs are 1.42×100=
142 rupees
hence, she got the profit of 15 per cents
15/100×142=21.3

Answer 2

given  girl bought eggs at 8.4 rupees a dozen/-.Hence for 1 egg she purchased for 0.7/-

she brought 100 eggs for 0.7*100=70 rupees

she must gain profit of 15% of cost price. Hence 70+(15/100)*70=80.5.hence she must sell 100 eggs for 80.5/- inorder to make a profit of 15%.