brcurtis brcurtis
  • 02-03-2018
  • Mathematics
contestada

A CD which usually sells for $15.78 has a 15% discount. Estimate the amount of the discount.

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jdoe0001 jdoe0001
  • 02-03-2018
if we take 15.78 to be the 100%, what is the 15%?

[tex]\bf \begin{array}{ccll} amount&\%\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 15.78&100\\ a&15 \end{array}\implies \cfrac{15.78}{a}=\cfrac{100}{15}\implies \cfrac{15.78\cdot 15}{100}=a[/tex]
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clarissahaney94
clarissahaney94 clarissahaney94
  • 30-08-2018

You need to round 15.78 to get 16. You then multiply 16 to 15 and divide by 100 to get your answer :

2.4

Which would also be $2.40

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