Emily runs a local bakery where she sells cupcakes. She buys ingredients to make a dozen cupcakes for $3.50 and sells each cupcake for $0.75. If she wants to make a profit of $150 in a week, how many dozens of cupcakes does she need to bake and sell? Additionally, if she spends 15 minutes baking each dozen, how many hours does she spend baking to reach her goal? Let's think step by step and output the final answer within \boxed{}.
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