1) What you're trying to do.
2) What the error is (which means tell us what your compiler error is; the exact words, all of them).
3) The code. Do NOT put your code on another site in a big heap and expect us to read it and magically guess what you're trying to do and what the problem is. This site has formatting options for you to post your code clearly. Do NOT post ALL the code. Post the code relevant to the error. If we need to see more code, we will ask.
You've posted a link to a picture of your code, and also a link that would enable us to download your code. All of it. That's extremely unhelpful. If you want people to help you, make it easier for them, not harder.
Your code is plain text. These posts are plain text with markup options. Do you get what I'm saying?
The problem here is that you are inheriting from more than one class, and those classes contain identically named functions.
Link inherits from mastercard. mastercard contains the function calculate.
Link inherits from visacard. visacard contains the function calculate.
Link inherits from localcard. localcard contains the function calculate.
So which calculate function is Link meant to inherit?