The last digit in an International Standard Book Number (ISBN) is called the check digit. It is calculated by multiplying the first digit by 10, the second digit by 9, the third digit by 8, and so on through the ninth digit, then summing these products and dividing by 11. The remainder is subtracted from 11 to give the check digit of the ISBN. Find the missing digit in the given ISBN. 02064d2741 The digit d is