A travel agency will plan a group tour for groups of size 30 or larger. If the group contains exactly 30 people, the cost is $250 per person. If each person's cost is reduced by $10 for each additional person above the 30, then the revenue is given by the equation shown below, where x is the number of additional people above 30.
R(x) = (30 + x)(250 − 10x)
Find the marginal revenue if the group contains 35 people.
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