Question

A different camera is selling for $7.50 off the regular price. It was marked down 15%. A student used the equation: 15(7.5) = Original price and found the regular price of the camera to be $112.50. Explain the error(s) in the student’s work.

Answer 1

Answer:

he multiplied 15 ×7.5, but he could multiply 15/100×7.5 to get the original price..

Answer 2

Answer:

The student should divide the discount amount by total percentage.

Step-by-step explanation:

In the above question, the student directly multiplied the total amount of the camera with the discount percentage.

Here,

• Discount and amount have two different units, so they cannot be compared together with conversion of unit.
• To calculate the original price of the camera, student needs to divide the selling amount by 100. Then multiply the discount amount with it.

I.e.

$Original price = \frac{7.5}{100} * 15$

Percentage of a number :

• Percentage is the number or ratio expressed in the terms of 100's.
• Percentage is denoted by '%'.
• The word percentage is the combination of two Latin words 'per' and 'cent'.

To calculate percentage of a number :

• $\frac{Number}{Total} * 100$

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