Which is the better buy?

A 100 erasers for $42
B 80 erasers for $32

To determine the better buy, we need to compare the prices per eraser for each option.

For Option A:
Price per eraser = $42 / 100 erasers
Price per eraser = $0.42

For Option B:
Price per eraser = $32 / 80 erasers
Price per eraser = $0.40

Therefore, Option B is the better buy as the price per eraser is lower ($0.40 compared to $0.42 for Option A).