I WILL GIVE YOU 18 POINTS IF YOU ANSWER THIS MATH PROBLEM!!!

These are the fees for sending a package by Media Mail:

$2.41 for the first pound

$0.40 per additional pound for the next six pounds

$0.39 per additional pound after that

For example, a two-pound package costs $2.82 to send by Media Mail.

If a package full of books costs $7.99 to send by Media Mail, how many pounds does the package weigh?