Samantha wants to save $2400 in 12 months for a new laptop. She plans to set aside a fixed amount of money every month from her monthly income. However, she knows that in 4 of those months, she will have additional expenses and can only save half of the usual amount. How much money does she need to save in the months without additional expenses to reach her goal? Let's think step by step and output the final answer within \boxed{}.
user