If one store sells 12 pens for $9.00 and another sells 10 pens for $7.80, which is the better deal? If you have to buy 120 pens, how much will you save by using the less expensive supplier? Compare prices per pen

Hi there!

Shop 1.

12 pens equals $9.00

1 pen equals $9.00 / 12 = $0.75

120 pens equals $0.75 * 120 = $90.00

Shop 2.

10 pens equals $7.80

1 pen equals $7.80 / 10 = $0.78

120 pens equals $0.78 * 120 = $93.60

Therefore shop 1 is the cheapest shop and offers the best deal. When buying 120 pens the second shop is $3.60 more expensive.