What is the check digit (d) for the UPC bar code number 5-11320-36217-d? A. 0 B. 7 C. 8 D. 9

   d) 9

Step-by-step explanation:

Step 1: Multiply each digit by the pattern 3, 1, 3, 1, ...

5 x 3 = 15

1 x 1 = 1

1 x 3 = 3

3 x 1 = 3

2 x 3 = 6

0 x 1 = 0

3 x 3 = 9

6 x 1 = 6

2 x 3 = 6

1 x 1 = 1

7 x 3 = 21

Step 2: Find their sum

15 + 1 + 3 + 3 + 6 + 0 + 9 + 6 + 6 + 1 + 21 = 71

Step 3: Subtract the sum from the nearest equal or higher multiply of 10

80 - 71 = 9