Luke can purchase a 10-pound item from several different stores. Which of the following is the best buy? A Buy online for $15 plus pay shipping costs of $1 per pound. B Buy online for $17 plus pay shipping costs of $0.50 per pound. C Buy at a local store where the item’s price is $25 and use a $3-off coupon. D Buy at a local store where the item’s regular price is $22 and it is on sale for 10% off.
so compare the various amounts
A: 15 + 10*1
B: 17 + 10*0.5
now do C and D and compare