The Amount of Salt in the Tank at Time T $A ( t ) = - 200 + 200.3 e ^ { t / 40 }$

Multiple Choice

The amount of salt in the tank at time t in the previous two problems is

A) $A ( t ) = - 200 + 200.3 e ^ { t / 40 }$
B) $A ( t ) = 200 - 199.7 e ^ { - t / 40 }$
C) $A ( t ) = 80 - 79.7 e ^ { - t / 40 }$
D) $A ( t ) = - 80 + 80.3 e ^ { t / 25 }$
E) $A ( t ) = 200 + 100 e ^ { - t / 40 }$