2. ken mails three packages at the post office that weigh 8.1, 8.5, and 8.9 pounds. the post office that ken 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 8 pounds and $2.75 for packages that weigh 9 pounds.
a. how much did ken pay to ship each package?
b. ken has $7.25 in his wallet in cash. use subtraction to determine whether ken has enough to mail the three packages and how much extra money he has or needs.