Tidewater City Bank has four branches with the following inputs and outputs:

The monthly output and input values for each bank are as follows:

Using data envelopment analysis (DEA), determine which banks, if any, are inefficient.

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input 1 = teller hours (100s) input 2 space (100s ft.²) = input 3 = expenses ($1,000s) output 1 = deposits, withdrawals, and checks processed (1,000s) output 2 = loan applications output 3 = new accounts (100s)