Explanation:
increase = 28 - 20 = 8.
% change = increase ÷ original × 100
= 8 ÷ 20 × 100
= 0.4 × 100
= 40%
∴ percentage change = 40%
Answer:
Step-by-step explanation: old students- 20
New students- 28
Percentage of change= New students - old students/ Old students x 100
= 28-20/20 x 100
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