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 is she uses Company 2?

A: $20.00
B: $5.00
C: $75.00
D:$100.00

To calculate how much Mrs. Hara will save per pair of glasses if she uses Company 2, we need to compare the prices of the two companies.

Company 1 sells glasses for $40 each, while Company 2 sells 4 glasses for $140.

To find out the price per pair of glasses at Company 2, we divide the total price by the number of glasses: $140 รท 4 = $35 per glasses.

Therefore, Mrs. Hara will save $40 - $35 = $5 per pair of glasses if she uses Company 2.

Hence, the answer is B: $5.00.

To find out how much Mrs. Hara will save per pair of glasses if she uses Company 2, we need to compare the price of Company 2 to the price of Company 1.

The cost of 4 pairs of glasses from Company 2 is $140, so the cost of 1 pair of glasses is $140/4 = $<<140/4=35.00>>35.00.

If Mrs. Hara uses Company 1, the cost per pair of glasses is $40, so she would save $40 - $35 = $<<40-35=5.00>>5.00 per pair of glasses.

Therefore, the correct answer is B: $5.00.

To determine how much Mrs. Hara will save per pair of glasses if she uses Company 2, we need to compare the prices of the two companies.

First, let's start with Company 1. They sell the glasses for $40 each.

Now, let's calculate the cost per pair of glasses from Company 2. They sell 4 glasses for $140. To find the cost per pair, we divide the total cost by the number of pairs: $140 / 4 = $35 per pair.

To calculate the savings per pair, we subtract the cost per pair from Company 2 from the cost per pair from Company 1: $40 - $35 = $5.

Therefore, Mrs. Hara will save $5.00 per pair of glasses if she uses Company 2. The correct answer is B: $5.00.