Which rate is the lowest price?

$6.30 for 9

$5.50 for 5

$4.20 for 7

$0.80 each

Answer: $4.20 for 7

This problem can be solved by dividing the pay by the number of items.

$6.30 / 9 = $0.70

$5.50 / 5 = $1.10

$4.20 / 7 = $0.60

$0.80 / 1 = $0.80

This shows that for the third option, $4.20 for 7, the rate per item is the lowest.