marginal revenue question..please help figuring out....here is the problem:?

admin_masu3701

New member
The demand function for an item is p= -0.025x+60, where the number of units of the item and p is the price per?

Find the marginal revenue for this item when x=100

The answer is $55 per unit...but how did they come up with this...i keep getting 59$...please help
 
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