Answer:
20%
Explanation:
Use the percentage increase formula:
Percentage increase = [(final value - initial value) ÷ initial value] x 100
Initial value = 20
Final value = 24
Therefore,
Percentage change = [(24 - 20) ÷ 20] x 100
= [4 ÷ 20] x 100
= 0.2 x 100
= 20%