1. The price decreased by 25%.
- Calculation: Original price = $200, Sale price = $150.
- Decrease = $200 - $150 = $50.
- Percentage decrease = ($50 / $200) * 100% = 25%.
2. The price increased by 20%.
- Calculation: Old price = $2.50, New price = $3.00.
- Increase = $3.00 - $2.50 = $0.50.
- Percentage increase = ($0.50 / $2.50) * 100% = 20%.
3. Last year’s price was $1.20 per liter.
- Calculation: Let last year's price be P.
- New price = P + 20% of P = 1.20P.
- Given 1.20P = $1.44, so P = $1.44 / 1.20 = $1.20.
4. His pay went up by 20%.
- Calculation: Original pay = $12.50, Increase = $2.50.
- Percentage increase = ($2.50 / $12.50) * 100% = 20%.
5. His bank balance grew by 30%.
- Calculation: Initial amount = $4,000, Final amount = $5,200.
- Growth = $5,200 - $4,000 = $1,200.
- Percentage growth = ($1,200 / $4,000) * 100% = 30%.
6. The new monthly rent is $2,400.
- Calculation: Original rent = $2,000, Increase = 20% of $2,000 = 0.20 * $2,000 = $400.
- New rent = $2,000 + $400 = $2,400.
Parent Tip: Review the logic above to help your child master the concept of percent increase and decrease word problems worksheet.
