The value, V(m), of a comic book m months after publication has a average rate of change of –0.04 between m = 36 and m = 60. Which statement must be true?
The value of the comic book decreased by a total of $0.04 between m = 36 and m = 60.
The value of the comic book increased by a total of $0.04 between m = 36 and m = 60.
The value of the comic book decreased by an average of $0.04 each month between m = 36 and m = 60.
The value of the comic book increased by an average of $0.04 each month between m = 36 and m = 60.

Question

The value, V(m), of a comic book m months after publication has a average rate of change of –0.04 between m = 36 and m = 60. Which statement must be true?
The value of the comic book decreased by a total of $0.04 between m = 36 and m = 60.
The value of the comic book increased by a total of $0.04 between m = 36 and m = 60.
The value of the comic book decreased by an average of $0.04 each month between m = 36 and m = 60.
The value of the comic book increased by an average of $0.04 each month between m = 36 and m = 60.