Please show step by step and formulas used, thank you!

Problem 5. X corporation has 3000 shares outstanding. John owns 800 shares, Mary owns 500 shares Z corporation owns 500 shares and Y partnership owns 600 shares. John and Mary are equal partners of Y partnership. John owns 40 percent of Z corporation. John's daughter owns 600 shares A Applying stock attribution rules, how many shares are owned by John