Answer:
64
Explanation:
80% can also be represented as .8 so you do .8*80 and you get 64.
Another way you can do this is you can find 10 percent of 80 which is 8 and you multiply that by 2 to get 20%, then you do that subtracted from 80, so it's 80-16=64.
Let me know if you have any questions.