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problem:
You are paid $ 24 an hour.
How much you earn in 40 hours?
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answer:
1. step: proportion
: 1 hour – 24 $
* 40 hours – x $
2. step: which proportion?
↑ more hours ↑ more money = directly proportional
3. step: formula
x = 24 * 40 : 1
x = 960 $
4. step: answer
In 40 hours you earn $ 960.