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Sagot :
Answer:
He determined pounds per dollar by dividing 10 by 25 but wrote the unit rate as a dollar value.
Step-by-step explanation:
Given
[tex]\frac{10\ pounds}{\$25} = \frac{10\ pounds}{25} / \frac{\$25}{25} = \frac{0.4}{1}[/tex]
[tex]Unit\ Price = 40\ cents[/tex]
[tex]40\ cents * 6 = \$2.40[/tex]
Required
Determine Ming's error
Ming's error is from here
[tex]\frac{10\ pounds}{\$25} = \frac{10\ pounds}{25} / \frac{\$25}{25} = \frac{0.4}{1}[/tex]
He calculated the unit rate as pound per dollar.
So, after calculating the unit rate, the unit should be:
[tex]Unit\ Rate = 0.4\ pound/\$[/tex]
But instead, he solved as:
[tex]Unit\ Rate = \$0.4/ pound[/tex]
Hence, (a) is correct
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