Question

An advertisement claims that a 5-pound box of detergent will wash 20 laods of laundry. A 5-pound box costs $3.50. A 15-pound box cots $10.00. How much will you save PER LOAD id you buy the 15-pound box?

Answer 1

You need to calculate cost per load for the two boxes.

The 5-lb box costs $3.50 and washes 20 loads:
$3.50/ 20 loads = $0.175/load

The 15-lb box costs $10.00 and washes 60 loads:
$10.00/60 loads = 0.167

The amount you save per load is:
$0.175 = $0.167 = $0.008 or just under 1 cent.