A 400-gallon cylindrical tank is filled with water. When a valve at the bottom of the tank is opened, the flow rate q (in gallons per minute) through the valve is: q(t) = 80e–0.2t where t is the time in minutes. Knowing that the total amount of water through the valve at any time is the integral of this function. Write a matlab program that solves the amount of water left in the tank after 15 minutes.

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