Financial & Managerial Accounting 3rd Edition by Charles Horngren,Harrison, Walter,Suzanne Oliver

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Pitfalls of e-commerce
Shannon's account at Commerce Bank has a balance of $1,200. Shannon's account number is 1236.
Requirement
1. Assuming the bank uses encryption for customer account numbers and the last digit is a check figure, show the mathematical formula the bank used to generate the last digit in Shannon's account. (Hint: you may use +, , ×, and ÷)