Question

Determine the check digit (d) for the UPC bar code number 2-91273-05213-d. Show your work?

Answer 1

the given UPC bar code digit is

2- 91273 - 05213 - d

for determining d we will follow the rule

first, we sum up all the odd place numbers

like

2 + 1 + 7 + 0 +2 + 3 = 15

then multiply with 3

15 * 3 = 45

then

we sum up all the even place numbers,

9 + 2 + 9 +5 + 1 = 26

now we will add these two results

26 + 45 = 71

now we can see that 71 is 9 less than the next multiple of 10 that is 80 in this case'

80 - 71 = 9

so the answer is

d = 9 .