First, you need to find 10% of $80. You do this by turning 10% into a decimal. This is 0.1. Multiply 80 x 0.1
This is 8, or $8.
Since it is a discount, you need to subtract from 80. So do 80-8.
This gives you 72.
Therefore, your answer is C, $72
I hope this helps! Happy Thanksgiving!