Jacob models his snowboard shop's profit over the last ten years with the function $P(t)$, where $t$ is the number of months the shop has been in business.

If:

$$\lim \limits_{t \to 65} \frac{P(65)-P(t)}{65-t}=\$5220 / \text{ month}$$

...what is the instantaneous rate of change in the profit when the shop has been in business for $65\text{ months}$?

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