Question

A shopkeeper bought 30 cricket balls at the rate of 40 per ball. He sold 20 balls at the rate of
50 per ball. At what rate should he sell the remaining balls to have a profit of 40% in the whole
transaction?​

Answer 1

$=30*40=1200\\=20*50=100\\=40\% of 1200\\=1200*140/100=1680\\=1680-1000\\=680\\=680/10\\=68\; is\; ur\; answer$