Develop a python-based calculating app with GUI

Dear freelancers,

I'm searching for a person with profound knowledge in Python (other programing languages are welcome, too) to develop a script with GUI to change
numeric values given in a csv file by randomly created percentage vaues whithin a span that can be entered into the GUI. The csv file has 20 columns in total. Two of this columns (price_gross and price_net) contain the concerning numeric values.
The GUI has to offer two input fields. When, for example, the values 20 and 150 are entered into the fields of the GUI, the numeric values given in the CSV have to be changed by a random
percentage value within the span of 20% to 150%. Both values within a row have to be changed by the same percentage value, the ones in the next row have to be changed by another
percentage value within the given span and so on. The numeric values have to be rounded to two decimal places with point . as decimal separator.
I can't upload CSV files, so a sample CSV file can be sent in the workstream.

Thanks for your attention, I'm looking forward to your proposals!