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7. So if the table was originally $80, and she got 15% off:
You can either multiply the 80x0.15 to get the amount of the DISCOUNT, which is $12 OFF, so she would have paid 80-12 = $68

OR

You could remember that if she got 15% off, she really paid 100% - 15%=85%; so $80x0.85 = $68

It is sometimes easier to do this the second way because there is one less step

8. So the magazine was originally $25, but the price went up 20%.

Again either you can calculate the amount it went up and add it: so 25 x .2 = $5, so she paid 25 + 5 = $30

OR

Know that the price really went from 100% to 120%, so you can multiply $25 x 1.20= $30

5/8 beds for each square yard