Portfolio Rebalancing

You have one million dollars in your investment account and choose to keep your money allocated in the following proportion and rebalance each quarter:

i. 60% in stocks via ETF SPY;

ii. 40% in bonds via ETF AGG.

Over the past quarter, SPY went up by 1% and AGG went up by 3%

a. What is your account balance before rebalancing?

b. How do you rebalance your account? What to buy and what to sell? How many dollars to buy and how many dollars to sell?