The first 11 digits of the UPC for McCormick's Sea Salt Grinder are 0 52100 02359 the correct missing check digit? What is 1) Odd positions: 0+2+0+0+3+9 = 14 14.3 = 42 2) Even positions: 5+1+0+2+5+ x = 13+x 3) 42+ 13+ x = 55+ x = 0 mod 10 4) 55 = 5 mod 10 55+ x = (5+ x) mod 10 Since 10 = 0 mod 10, 5+x = 10 x = 5 The full UPC for McCormick's Sea Salt Grinder is 0 52100 02359 5. The 9-digit bank identification number on checks from U.S. banks use a similar process. 1) Add the 1", 4, and 7h digits and multiply the total by 7. 2) Add the 2nd, 5, and 8h digits and multiply the total by 3. 3) Add the 3r, 6, and 9h digits and multiply the total by 9. 4) The total of these three results must be equivalent to 0 mod 10. Determine the last digit of a bank code with the first 8 digits: 62910027 1) 6+1+2 = 9 9.7 = 63 2) 2+0+ 7 = 9 9 .3 = 27 3) 9+0+ x = 9+x=(9+ x). 9 = 81 + 9x 4) 63 + 27 +81 + 9x = 171 +9x 171 = 1 mod 10 Since 171 +9x = 0 mod 10 and 171 = 1 mod 10, then 9x = 9 mod 10 The smallest positive integer that is equivalent to 9 mod x is 9 9x = 9 and x = 1 The bank identification number is: 629100271