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Need help on number 20 please. Thank you.

Need help on number 20 please. Thank you.-example-1

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ok so 115% of the meal costed $7.36 (we can assume this because he had to use his $5 gift card+2.36 )  then we can divide the total cost of his meal by the percentage, and then multiply it by 100   (7.36/115) x 100  and we get  $6.4 
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