Answer:
8%
Explanation:
Original rectangle:
perimeter = 2(length + width)
perimeter = 2(30 cm + 20 cm)
perimeter = 100 cm
Modified rectangle:
length = 30 cm + 10% of 30 cm
length = 1.1 × 30 cm = 33 cm
width = 20 cm + 5% of 20 cm
width = 1.05 × 20 cm = 21 cm
perimeter = 2(33 cm + 21 cm)
perimeter = 108 cm
Original perimeter: 100 cm
Modified perimeter: 108 cm
percent change = (new value - old value)/(old value) × 100%
percent change = (108 cm - 100 cm)/(100 cm) × 100%
percent change = 8%
Answer: 8%