Question

A factory earns a profit of 8 per pack of pencils sold and a loss of 5 per pack of pens sold. (a) The factory sells 3,000 packs of pencils and 5,000 packs of pens in a month. What is its profit or loss? (b) what is the number of packs of pencils it must sell to have neither profitnor loss if 6,400 packs of pens are sold?

Answer 1

$pencil = profit = 1packet = 8 \: rs. \\ 3000pack \: of \: pencil = 3000 \times 8 \\ = 24000 \\ pen = loss = 1packet = 5 \: rs. \\ 5000 \: packets = 5000 \times 5 = 25000 \\ then \: profit = 24000 \\ loss = 25000$