Percentage Increase Calculation

Steps:

• Subtract initial percentage from final: 1.5% - 0.2% = 1.3%
• Divide difference by initial percentage: 1.3% / 0.2% = 6.5
• Multiply by 100 to get percentage increase: 6.5 × 100% = 650%

Why D is correct:

• Percentage increase formula is ((final value - initial value) / initial value) × 100%, applied to the percentages of infections.

Why the others are wrong:

• A: Represents absolute increase (1.3 percentage points), not relative percentage increase.
• B: No valid calculation yields 8%; likely a misapplication of averaging or unrelated metric.
• C: Results from incorrectly dividing by 1% instead of 0.2%, giving (1.3 / 1) × 100% = 130%.

Final answer: D