Ali and Yousef established AY partnership on January $1,2020.$ Each one invested $20000.$ On March $1,$ Ali invest $2000,$ on June $1$ Yousef invests $4000.$ On September $1,$ Ali withdraws $1000.$ On November $1,$ Yousef withdraws $3000.$ Net income $100000.$ Suppose that the partners share net income or loss equally. Ending capital balance of Ali

a$.71000$

b$.78000$

c$.77000$

d$.80000$