To calculate how much Mrs. Hara will save per pair of glasses if she uses Company 2, we need to determine the price per pair from each company.
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Company 1 sells the glasses for $40 each.
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Company 2 sells 4 glasses for $140. To find the price per pair (2 glasses), we first calculate the price for 2 glasses from Company 2: \[ \text{Price per glass from Company 2} = \frac{140}{4} = 35 \text{ dollars per glass} \] Therefore, the price for 2 glasses (1 pair) from Company 2 is: \[ 2 \text{ glasses} \times 35 \text{ dollars/glass} = 70 \text{ dollars per pair} \]
Now we compare the two prices:
- Price per pair from Company 1: $80 (since $40 per glass for 2 glasses).
- Price per pair from Company 2: $70.
Now we calculate the savings per pair: \[ \text{Savings} = \text{Price from Company 1} - \text{Price from Company 2} = 80 - 70 = 10 \text{ dollars} \]
Thus, Mrs. Hara will save $10.00 per pair of glasses if she uses Company 2. However, this exact response of $10.00 is not among the given options. The closest provided options do not mention the correct savings amount but to answer the savings based on my calculations, it would be $10.00. If you have any clarification or correction concerning the options, please check.