To calculate the percentage increase of each city we must,
1. Find the population change for the city
2. Then write this change as a fraction (Population Change/Population in 1988)
3. Divide the numerator by the denominator to find the decimal
4. Multiply the decimal by 100 to calcuate the percentage change
City A
1. Population Change: 50 - 40 = 10
2. Population Change represented as a fraction: 10/40
3. Population Change represented as a decimal: 10/40 = 0.25
4. Population Change represented as a percentage: 0.25 x 100 = 25% increase
City B
1. Population Change: 70 - 50 = 20
2. Population Change represented as a fraction: 20/50
3. Population Change represented as a decimal: 20/50 = 0.4
4. Population Change represented as a percentage: 0.4 x 100 = 40% increase
City C
1. Population Change: 100 - 70 = 30
2. Population Change represented as a fraction: 30/70
3. Population Change represented as a decimal: 30/70 = 0.43 (2dp)
4. Population Change represented as a percentage: 0.43 x 100 = 43% increase
City D
1. Population Change: 130 - 100 = 30
2. Population Change represented as a fraction: 30/100
3. Population Change represented as a decimal: 30/100 = 0.3
4. Population Change represented as a percentage: 0.3 x 100 = 30% increase
City E
1. Population Change: 160 - 120 = 40
2. Population Change represented as a fraction: 40/120
3. Population Change represented as a decimal: 40/120 = 0.33 (2dp)
4. Population Change represented as a percentage: 0.33 x 100 = 33% increase
Therefore City C had the greatest population percentage increase.