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The cumulative profit a business has earned is changing at a rate of $r(t)$ dollars per day (where $t$ is the time in days). In the first $30$ days, the business earned a cumulative profit of $\$ 1700$.$\newline$What does $1700+\int_{30}^{90} r(t) d t$ represent?$\newline$Choose $1$ answer:$\newline$(A) The cumulative profit the business has earned as of day $90$$\newline$(B) The change in the cumulative profit between days $30$ and $90$$\newline$(C) The rate at which the cumulative profit was increasing when $t=90$.$\newline$(D) The time it takes for the cumulative profit to increase another $\$ 1700$ after the first $30$ days