The Divide into 5 portions of sum of the 1st and 7th digits

The sum of the 1st digit and the 7th digit of the lucky draw number is divided into 5 divisions

Part 1: 1 - 20

Part 2: 21 - 40

Part 3: 41 - 60

Part 4: 61 - 80

Part 5: 81 - 99