Antoine and Tess have a disagreement over how to compute a 15 percent gratuity on 46 point 0 0 dollars Tess says, “It is easy to find 10 percent of 46 by moving the decimal point one place to the left to get 4 point 6 0 dollars Do that twice. Then add the two amounts to get 4 point 6 0 dollars plus 4 point 6 0 dollars is equal to 9 point 2 0 dollars for the 15 percent gratuity.” How should Antoine respond to Tess’s method?
Answer
A
“Tess, you should use a table with 5 percent segments to find the gratuity. Each 5 percent segment has a value of 9 point 2 0 dollars , so that is the 15 percent gratuity.”
B
“Tess, the best way to find 15 percent of 46 point 0 0 dollars is to multiply 1 over 15 by 46 point 0 0 dollars to get 3 point 0 7 dollars , which is the 15 percent gratuity.”
C
“Tess, you found 20 percent of the number because you added 10 percent and 10 percent . You need to add 10 percent to 1 half of 10 percent . Add 4 point 6 0 dollars and 2 point 3 0 dollars to get 6 point 9 0 dollars , which is the 15 percent gratuity.”
D
“Tess, the best way to find 15 percent of 46 point 0 0 dollars is to multiply 0 point 0 1 5 and 46 point 0 0 to get 0 point 6 9 dollars , which is the 15 percent gratuity.”
Explanation
Tess added 10% twice, which gives 20%, not 15%. Ten percent of $46.00 is $4.60, and half of that is $2.30, which is 5%. Adding $4.60 and $2.30 gives $6.90, so choice C correctly explains how to find the 15% gratuity.
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