Question

A video game that usually costs $30.65 is marked down 60%. Kelvin determined that the new price of the game would be $18.39. Look at Kelvin’s work and find his error.
($30.65)(0.60) = $18.39

Answer 1

Given: A video game that usually costs $30.65 is marked down 60%. Kelvin determined that the new price of the game would be $18.39.

To find: Find Kelvin's error.

Solution:

• If the video game is marked 60% down, it means that the cost is reduced by 60% of its original value.
• To find out the new price, 60% of the old price is to be subtracted from the old price and the calculations are as follows,

       $30.65 - (\frac{60}{100} * 30.65 ) = 12.26$

• The value calculated by Kelvin is the value to be subtracted, that is, 60% of the old value.
• But what had to be found was the value after subtraction, that is, the value of new price.

Therefore, Kelvin found the value to be reduced from the old price instead of finding the new price. That was his error.

Answer 2

Answer:

Step-by-step explanation:

Kelvin should have subtracted $18.39 from $30.65 to find the marked down price. He could also have multiplied the original cost by 40% to find the sale price of $12.26.