Math crossword puzzle

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Across
  1. 1. a sum of money paid for how much someone makes
  2. 5. measures the relative difference in percent
  3. 6. a measure of how much a price has grown in percent.
  4. 10. a simple calculation based on the percentage of a retail price of a good
  5. 12. a deduction of something that costs its usual amount temporarily.
  6. 13. a number or ratio expressed as a fraction of 100
  7. 14. a tip left for someone
  8. 17. the reduction of something in percent
  9. 18. the price a retailer pays for goods
  10. 20. the difference between a calculated answer and the actual answer
Down
  1. 2. an interest charge that borrowers pay lenders for loan
  2. 3. a relationship between two things expressed in numbers
  3. 4. the cost of borrowing money from someone
  4. 7. an additional amount of money you are paying voluntarily
  5. 8. the difference between a measured value and true value in percentage
  6. 9. an amount of money charged for something
  7. 11. the original amount of money invested
  8. 15. the amount added to a price to determine its selling price
  9. 16. a reduction in price permanently.
  10. 19. a price that a seller charges the buyer