Help me about loops

[buran]

number of issues:
you start with a being, number of cases, while in the previous post that is b column.
what is h?
you claim you cannot write a column, but you print a? I guess there is some confusion between a and b in the previous example and here.

def calculate(cases, rate):
    return int(cases * (rate / 100 + 1))

n = 1
cases = int(input('Number of cases: ')) # do you really want a float for cases
rate = float(input('Percentage increase: '))
while cases <= 3000:
    print(f'{n}) {cases}')
    cases = calculate(cases, rate)
    n += 1

Output:
Number of cases: 150
Percentage increase: 50
1) 150
2) 225
3) 337
4) 505
5) 757
6) 1135
7) 1702
8) 2553

in your original post the column b increase by fixed number - 150, not by given percent in which case you can use a for loop