In the Previous Two Problems, the Amount of Salt in the Tank

Multiple Choice

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

A) $A ( t ) = - 75 + 77 e ^ { 2 t / 25 }$
B) $A ( t ) = 75 - 73 e ^ { - 2 t / 25 }$
C) $A ( t ) = 50 - 48 e ^ { - 2 t / 25 }$
D) $A ( t ) = - 50 + 52 e ^ { 2 t / 25 }$
E) $A ( t ) = 75 - 73 e ^ { 2 t / 25 }$