Answer:$13.60
Explanation:
Multiply 20 times 0.4 to get 40% of 20 dollars. Then subtract 8 from 20 leaving you with 12. Multiply 20 by 0.08 to get 8% of 20 dollars. Which will give you 1.6. Add 12+1.6 and you will get 13.60 dollars.
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