SICP Exercise 3.11

1，The result of  (define acc (make-account 50)):

2, Environments when evaluating ((acc 'deposit) 40):

3, Result of ((acc 'deposit) 40):

4, Environments when evaluating ((acc 'withdraw) 60):

5,The result of ((define acc2 (make-account 100)):

The two account kept local states distinct by using different environment. Note: I assumed that the code is shared.