To find the best buy, we need to calculate the cost per eraser for each brand.
Brand A: 2.50 รท 20 = $0.125 per eraser
Brand B: 3.25 รท 35 โ $0.093 per eraser
Brand C: 5.25 รท 50 = $0.105 per eraser
Brand D: 10.00 รท 100 = $0.10 per eraser
Based on the calculations, Brand B is the best buy with approximately $0.093 per eraser.