Math function crossword

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Across
  1. 3. date The date a debt must be paid
  2. 6. one number or amount away from another.
  3. 7. money paid regularly at a certain rate for borrowing money
  4. 9. A bill
  5. 10. reduction in price
  6. 11. rates rate of increase in size per unit time
  7. 12. Deduction of the usual cost
Down
  1. 1. Number expressed as a certain number of parts of something divided into 100 parts
  2. 2. combining two number together
  3. 4. order Requesting a vendor to furnish goods to a purchaser.
  4. 5. adding a number to itself a certain number of times
  5. 6. A receipt
  6. 8. adding several numbers together, then dividing the total by the number of quantities
  7. 13. drawer Cash register