Notebooks cost $1.20 each. this weekend they will be $.80 what percentage is the sale?

The sale is 33% off notebooks. This can be found by first subtracting .8 from 1.2

1.2-.8=.4    Now divide .4 by 1.2 to get your answer.

=.33

.33=33%

You can also solve this mentally because if you know your basic multiplication tables, 3*4=12 and so of 12 would equal 8.

Does you understand it now?

yes

Step-by-step explanation:

The definition of vertical angles prove lines are parallel

Angle 34 = angle 34