Assuming that the three checks that were returned were deposited before Jan 29 and was returned also before Jan 29, the three deposited checks will be added to get 216.77. Next, we subtract 324.18 with 487.38 to get 163.2 which is the difference of Jan 18 and Jan29's balance. Then add 163.2 and 216.77 to get 379.97, the total amount deposited