Question

Dara needs to mails three packages that weigh 6.1, 6.5, and 6.8 pounds. The mail delivery service that Dara uses rounds the weight of a package to the nearest pound to determine the price of shipment. It costs $2 to mail a package that weighs 6 pounds and $2.75 for packages that weigh 7 pounds. (a) How much would Dara pay to ship each individual package? (b) Dara has $7.25 in cash to spend. Show how subtraction can be used to determine whether Dara has enough to mail the three packages and how much extra money she has or needs.

Answer 1

a) She pays $2, $2.75 and $2.75 respectively.

b) $7.25-(2+2.75+2.75)\\7.25-7.5\\-0.25$

She does not have enough money because the difference between the amount of money she has and the amount of money she has to pay is negative, meaning she is missing money.