The Graph Shows an Idealized Linear Relationship for the Average $$\begin{array} { c c c } 1995 & 1997 & 1999 \\a = \$ 452 ; b = \$ 524 & &\end{array}$$

Multiple Choice

The graph shows an idealized linear relationship for the average monthly payment to retirees from 1995 to 1999. Use the midpoint formula to estimate the average payment in 1997.
Average Monthly Payment to Retirees
$$\begin{array} { c c c } 1995 & 1997 & 1999 \\a = \$ 452 ; b = \$ 524 & &\end{array}$$

A) $36
B) $524
C) $488
D) $500