
John B. answered 12/16/20
Daily Excel user since 1997, daily Google sheets user since 2015
Mustafaa,
Full disclaimer: I know nothing about Pounds, Pence or VAT so please double check my understanding and math before you rely on these calculations.
Also, I think I interpreted correctly how the credit card fees were calculated, but I am not 100% sure. Please double check that my math matches how the fee is actually calculated.
The user would adjust the amount in B2 until B13 is as close to 18% as you would like.
The formulas are shown so you can recreate this sheet on your own.
If this answered your question, I would appreciate an Upvote. If I didn't successfully answer your question, please leave a detailed comment and let me know where my understanding of your question missed the mark and I will do my best to make corrections.
John

John B.
I am not sure why there is no audio. If you ask the question again leave a comment here and I will re-record the answer.12/16/20