Question
Sophia earns $100 for 5 hours. At this rate, money earned in 15 hours is _________________.
- 300
- 200
- 250
- 350
Hint:
The unitary method is a technique for solving a problem by first finding the value of a single unit, and then finding the necessary value by multiplying the single unit value.
The correct answer is: 300
Here, it is given that Sophie earns $100 in 5 hours. we have to find the amount she earns in 15 hours.
Amount earned in 5 hours = $100.
Amount earned in 1 hour = 100/5 = $20.
Amount earned in 15 hours = 20 × 15 = $300.
Hence, the correct option is A.
We can also find the total amount earned in 15 hours by multiplying the amount earned in 5 hours by 3.
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