Wanda's homework was to find 73% of $400

Question

A tape diagram. 0 dollars is 0 percent. Question mark dollars is 73 percent. 400 dollars is 100 percent. (7.3) (400) = 2,920. 73 percent of 400 dollars is 2,920 dollars.

What error did Wanda make?
None. Wanda’s work is correct.
Wanda converted the percent to a decimal incorrectly. It should be 0.073.
Wanda converted the percent to a decimal incorrectly. It should be 0.73.
Wanda has the wrong label. It should be hours, not dollars.

Answer 1

Wanda made an error in her calculation regarding the conversion of the percent to a decimal and the multiplication step.

To find 73% of $400 correctly, you need to convert 73% to a decimal. The correct conversion is:

73% = 0.73 (not 0.073).

Then you multiply:

0.73 × 400 = 292.

Therefore, Wanda's conclusion that 73% of $400 is $2,920 is incorrect, and the correct answer is $292.

So, the error Wanda made is: Wanda converted the percent to a decimal incorrectly. It should be 0.73.