The following questions refer to Figure $2,$ the main result from Sternberg $(1969)$ experiment $1.$

Figure $2$: Stimuli demonstrating the Stroop Effect.

$(13)$ The line fitting the data on this plot is described by the equation $RT=397\mathrm{.}2+37\mathrm{.}9s,$ where $s$ is the size of the memory set. What does this predict reaction time to be when $s=20?$