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. how much will you save per load if you buy the 15-pound box? (round all answers to the nearest tenth of a cent.)

Answer 1

5 pounds = 20 loads = $3.50
convert to per-load:
1/4 pound = 1 load = 13.5 cents

15 pounds = 60 loads = $10
convert to per-load:
1/4 pound = 1 loads = 16.7 cents

you would save 3.2 cents per load