Plz help me to my business card activity

Answer 1

Where is business card activity?

Answer 2

Each question thread is different from others. You posted your task description in others thread.
here add full details of your task description and your trouble with your try..

As I seen, it just to find :
8000 - 10% of 8000 + 500 = 7700.

https://www.sololearn.com/discuss/333866/?ref=app