Question

a vendor bought 100 oranges for Rs 200 he sold 20 of them at a gain of 5%. At what gain percent must he sell the remainder so as to gain 30% on the whole

Answer 1

cp of 100 oranges=200
cp of 1 oranges=200/100=2
cp of 20 oranges= 20×2=40Rs
Sp of 20 oranges at 5%profit=40+5/100×40=42
Cp of remaining oranges= 200-40=160
Sp of " "at 30% profit=160+30/100×160
" " " " " " " =208 remaining remaning oranges he will sold at 30% profit=208Rs