Creating and testing check digits.
a. Create a spreadsheet that will take as input a five-digit account number and calculate a check digit using this formula: (5 x left-most digit + 4 x next digit + 3 x third digit + 2 x fourth digit + fifth digit) modulus division by 7. (Modulus division returns the remainder - for example: 11 modulus division by 3 = 2). The check digit then becomes the 6th (right-most) digit in the account number. Your spreadsheet should look like this:

b. Add another panel to the spreadsheet that takes as input a six-digit account number and uses the check digit formula in part a to test whether or not the account number is valid. Your solution should look like this:

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