The answer is 630.5. What you’d need to do to solve the problem is multiply 3% (0.03) by 650 and you’d end up getting 19.5. Subtract the number you got (19.5) from 650, and you’ll end up with your answer.
Yes, because x turns to into 1/10.
If she works 40 hours getting paid $12 an hour she will get $480
Normally 7 envelopes but on rare occasions, there may be more due to If the packages are filled with Envelopes. Also depending on if the 7 packages are boxes of envelopes, and in that case, 140 envelopes times 7, which would be 980 envelopes in the 7 packages. 140 * 7 = 980.