Each book costs $1.20 each
This price is at 100%
You have to figure out the percentage.
100%=$1.20
1.20*x=0.80*100
x being the new price
1.20x=80
x=80/1.20
x=66.7%
You will want to round the 66.7% to the nearest tenth
Your answer is 67% off the original cost of the notebook