Answer:
$397.85
Explanation:
Given that Zoey earns $392.40 for 18 hours' work, you want to know her earnings for 18.25 hours' work.
Proportion
Wages are propotional to hours, so her earnings for 18.25 hours will be ...
18.25/18 × $392.40 = $397.85
Zoey will earn $397.25 for 18.25 hours' work.
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Additional comment
You could write the proportion as ...
(18.25 hours)/(18 hours) = (pay for 18.25 hours)/(pay for 18 hours)
18.25/18 = x/392.40
Multiplying by the 392.40 gives the expression we used above:
x = (18.25/18) · 392.40
Or, you can solve for the hourly rate:
rate = $392.40/18 = $21.80 . . . . per hour
Then multiply this by hours:
$21.80/h · 18.25 h = $397.85
If you combine these steps, you see they become ...
(392.40/18)(18.25) = 392.40(18.25/18) . . . . same as above
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