Final answer:
The better buy is determined by comparing the cost per pen of Option A and Option B. Option A offers pens at $0.75 each, while Option B offers pens at $0.90 each. Option A is the better buy.
Step-by-step explanation:
To determine which option is the better buy, we can calculate the cost per pen for both Option A and Option B.
For Option A, the cost per pen is calculated by dividing the total cost by the number of pens: $63 ÷ 84 pens = $0.75 per pen.
For Option B, we use a similar calculation: $45 ÷ 50 pens = $0.90 per pen.
Comparing the two costs per pen, we can see that Option A offers a lower cost per pen at $0.75 versus the $0.90 per pen of Option B. Therefore, Option A is the better buy.