A travel agency will plan a group tour for groups of size 25 or larger. If the group contains exactly 25 people, the cost is $290 per person. If each person's cost is reduced by $10 for each additional person above the 25, then the revenue is given by the equation shown below, where x is the number of additional people above 25.R(x) = (25 + x)(290 − 10x)Find the marginal revenue if the group contains 30 people.

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