Answer:
1-20: Make it 0 units tall (change nothing)
21-40: Make it 1 unit tall
41-60: Make it 3 units tall
61-80: Make it 2 units tall
81-100: Make it 2 units tall
Step-by-step explanation:
1-20: (0 numbers)
21-40: 33 (1 number)
41-60: 43, 44, 52 (3 numbers)
61-80: 75, 79 (2 numbers)
81-100: 86, 89 (2 numbers)