To determine the benefit Mrs. Hayakawa would save by walking to and from work instead of riding the bus for five weeks, we need to calculate the total cost of the bus fare for the given time period.
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The cost of a one-way bus trip is $2.40. Therefore, the round trip cost (to and from work) would be: \[ 2.40 \times 2 = 4.80 \text{ (for one day)} \]
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If she works Monday through Friday, that means she travels 5 days a week. The weekly cost for bus fare would be: \[ 4.80 \text{ (per day)} \times 5 \text{ (days)} = 24.00 \text{ (for one week)} \]
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For five weeks, the total cost for bus fare would be: \[ 24.00 \text{ (per week)} \times 5 \text{ (weeks)} = 120.00 \]
Thus, if Mrs. Hayakawa walks instead of riding the bus, she would save $120 over five weeks.
So the correct answer is: 1. Mrs. Hayakawa would save $120.