Explaining the meaning of a derivative

Homework Statement

As the result of a survey, the marketing director of a company found that the revenue, $R, from selling n produced items at$P is given by the rule R=30P-2P^2

Find dR/dP and explain what it means

Homework Equations

I've found the dR/dP, however, I'm unsure of what this means in terms of the criteria in the question

The Attempt at a Solution

dR/dP= 30-4P

Edit:
Don't worry! Just solved it, it's rate of change of revenue with respect to price. I'm so silly

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