The school store is running low on erasers for pencils. They want to order more, so they look at the prices for 4 brands.

Which one is the best buy?
Brand A: 20 for $2.50
Brand B: 35 for $3.25
Brand C: 50 for $5.25
Brand D: 100 for $10.00

To determine the best buy, we need to compare the price per eraser for each brand.

Brand A: $2.50 / 20 erasers = $0.125 per eraser
Brand B: $3.25 / 35 erasers = $0.093 per eraser
Brand C: $5.25 / 50 erasers = $0.105 per eraser
Brand D: $10.00 / 100 erasers = $0.10 per eraser

Based on the price per eraser, brand B is the best buy at $0.093 per eraser.