Question

An advertisement claims that a 5-pound box of detergent will wash 20 loads of laundry. A 5-pound box costs $3.50. A 15-pound box costs $10.00. About how much will you save per load if you buy the 15-pound box?

Answer 1

10.00 / 10 = .66

3.50 / 5 = .70

.70 - .66 = .4

you saved .4 per load