Sales of Volkswagen's popular Beetle have grown steadily at auto dealerships in Nevada during the past $5$ years $($see table below$).$ Using exponential smoothing with a smoothing constant $(\backslash$alpha $)$ of $0\mathrm{.}30$ and a starting forecast of $410\mathrm{.}00,$ the following sales forecast has been developed: Using smoothing constants of $0\mathrm{.}60$ and $0\mathrm{.}90,$ develop forecasts for the sales of VW Beetles. Use MAD to determine which of the three smoothing constants $(0\mathrm{.}30,0\mathrm{.}60,$ or $0\mathrm{.}90)$ gives the most accurate forecast. The MAD for a forecast developed using exponential smoothing with $\backslash$alpha $=0\mathrm{.}30$ is sales. $($Round your response to two decimal places.$)$