The student calculated the percentage change in mass of each potato piece.
For one potato piece:
• the starting mass was 2.5 g
• the end mass was 2.7 g.

Calculate the percentage increase in mass of the potato piece.
Use the equation:
percentage increase in mass = (increase in mass / starting mass) × 100

**Step 1: Calculate the increase in mass.** The formula requires the "increase in mass". Increase in mass = End mass - Starting mass Increase in mass = 2.7 g - 2.5 g = 0.2 g **Step 2: Use the given equation to find the percentage increase.** Percentage increase = (increase in mass / starting mass) × 100 Percentage increase = (0.2 / 2.5) × 100 **Step 3: Complete the calculation.** 0.2 ÷ 2.5 = 0.08 0.08 × 100 = 8 The percentage increase in mass is 8%.