Mrs. Hara wants to purchase blue light blocking glasses for her family. Company 1 sells the glasses for $40 each, and Company 2 sells the same glasses at 4 for $140. How much will Mrs. Hara save, per pair of glasses, if she uses Company 2?
The price per pair of glasses at Company 1 is $40.
The price per pair of glasses at Company 2 is $140 / 4 = $<<140/4=35>>35.
Therefore, Mrs. Hara will save $40 - $35 = $<<40-35=5>>5 per pair of glasses. Answer: \boxed{5}.
To find out how much Mrs. Hara will save per pair of glasses, we need to calculate the price per pair for both companies.
For Company 1: The glasses are sold for $40 each, so the price per pair is $40.
For Company 2: The glasses are sold at 4 for $140. To find the price per pair, we divide the total price by the number of pairs. The total price for 4 pairs is $140, so the price per pair is $140/4 = $35.
To calculate the amount saved per pair, we subtract the price per pair for Company 2 from the price per pair for Company 1.
$40 - $35 = $5
Therefore, Mrs. Hara will save $5 per pair of glasses if she uses Company 2.
To determine the amount Mrs. Hara will save per pair of glasses if she uses Company 2, we first need to compare the per-glass price of each company.
Company 1 sells blue light blocking glasses for $40 each, while Company 2 sells 4 glasses for $140. To find the per-glass price for Company 2, we divide the total price by the number of glasses: $140 รท 4 = $35.
Now, we can compare the prices. Mrs. Hara will save $40 - $35 = $5 per pair of glasses if she buys from Company 2.