Here are the sales revenues for the past five years: YearRevenue $($millions$)1$$$4,887\mathrm{.}925,065\mathrm{.}435,535\mathrm{.}645,730\mathrm{.}855,499\mathrm{.}7$ a$.$ Based on MAD over years $3,4$ and $5,$ which method $($linear$-$trend or double exponential smoothing method with a $=0\mathrm{.}4$ and b $=0\mathrm{.}2($start with initial estimates S$1=$ $$4,867\mathrm{.}90$ and T$1=$ $$201\mathrm{.}5$ for the year $1))$ provides the better forecasts? Explain. Forecast the sales revenues for years $6$ and $7$ based on the better method