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Suppose that your weekly cash expenses are $70. Every time you withdraw money from the automated teller at your bank, you are charged $0.1. Your bank account pays interest of 3% annually, a. How often should you withdraw funds from the bank? (Round your answer to 2 decimal places.) You should go to the bank about once every week(s). b. What is the optimal-sized withdrawal? (Round your answer to the nearest whole doller.) Optimal-sized withdrawal $ c. What is your average amount of cash on hand? (Round your answer to the nearest whole dollar.) Average amount of cash on hand