Final answer:
Without Joe's specific broker's fee schedule, the commission fee cannot be precisely calculated. Assuming a flat rate commission similar to the examples, the total charge by the broker would include the purchase amount plus a hypothetical commission fee, such as $10, for illustrative purposes.
Step-by-step explanation:
Given Joe's scenario, without a complete fee schedule it's incomplete to provide a direct answer to how much the commission fee would be. However, if we assume a commission structure similar to the provided examples where a flat fee per transaction is applied (regardless of the transaction amount), we can calculate the total amount charged by the broker for the purchase of stocks, but not the commission itself. Since Joe wants to purchase 50 shares at $15 each, the total purchase amount would be 50 shares * $15 = $750.
Without the specific fee schedule for Joe's broker, we cannot determine the exact commission, however, from the examples, we can assume a potential commission could be a flat rate, let’s take for instance $10 (not part of the given options), which is similar to the example rates. So the total amount charged by the broker, including the assumed commission, would be $750 + $10 = $760. It is important to note that without the actual fee schedule for Joe's broker, these amounts are speculative and are used for illustrative purposes based on the examples provided.