21) 9%

Change in Target area = 131 – 161 = -30
% change in Target area = (⁻³⁰⁄₁₆₁) x 100 ≈ (⁻³⁰⁄₁₆₀) x 100 ≈ 18.75%

Change in Division area = 6442 – 7164 = -772
% change in Division area = (⁻⁷⁷²⁄₇₁₆₄) x 100  ≈ 10%

Percentage difference = 18.75 – 10 = 8.75 ~ 9%

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