A travel agency will plan a group tour for groups of size 40 or larger. If a group contains exactly 40 people, the cost is $360 per person. If each person's cost is reduced by $10 for each additional person above the 40, then the revenue is given by the equation shown below, where x is the number of additional people above 40. R(x) = (40 + x)(360 - 10x) Find the marginal revenue if the group contains 45 people.

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