When we perform a 'digit slide' on a number, we move its unit's digit to the front of the number. For example, the result of a 'digit slide' on 1947 is 7194. Let 'z' be the smallest positive integer with 8 as its unit's digit such that the result of a 'digit slide' on the number equals 4 times the number. What is the sum of digits of this number?(sum of digits of 1947 is 21) O 38 0 28 O23 O 18

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