algebra word problem

Karen mails 3 packages that weigh 7.2, 7.5, and 7.9 pounds. The post office rounds the weight to the nearest pound. It costs $3 to mail 7 pounds and $3.75 for 8. How much did she pay to ship each? She has $10.25 in cash. Use subtraction to determine whether she has enough and how much extra she has or needs.

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