22. Oil is pumped into an oil tank at the rate of \( S(t) \) gallons per hour during the time interval \( 0 \leq t \leq 8 \) hours. During the same time interval, oil is removed from the tank at the rate of \( R(t) \) gallons per hour. If the oil tank contained 200 gallons of oil at time \( t = 0 \), which of the following expressions shows the amount of oil in the tank at time \( t = 6 \) hours?
Answer is: option3
Solution:
\( 200 + \int_0^6 (S(t) - R(t)) \, dt \)
