A department store has an online site that customers can order from. The shipping rates are calculated as listed. • A package that weighs no more than 10 pounds costs $5. • A package that weighs more than 10 pounds but no more than 20 pounds costs $10. • A package that weighs more than 20 pounds but no more than 30 pounds costs $15. • A package that weighs more than 30 pounds but no more than 40 pounds costs $20. • A package that weighs more than 40 pounds but no more than 50 pounds costs $25.
