To find out how much money Rachel started off with, we will work backwards from the amount of money she has left.
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Rachel has $40 left.
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Before going to the amusement park, she spent $30 on a ticket. So, adding that to the $40 she has left: \( 40 + 30 = 70 \) Now Rachel has $70 before going to the park.
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Next, we consider the food expenses of $65: \( 70 + 65 = 135 \) So, before spending on food, she had $135.
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Then, we add the gas expenses of $45: \( 135 + 45 = 180 \) So, before spending on gas, she had $180.
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Finally, we add the hotel expenses of $120: \( 180 + 120 = 300 \) Therefore, before any of her expenses, Rachel must have started with $300.
So, Rachel started off with $300.
However, none of the provided answer options (41, 38, 10, 7) match this amount based on our calculations.