a$)$ Calculate the exponential smoothing with trend forecast for these data using an of $0\mathrm{.}30,$ a of $0\mathrm{.}30,$ an initial trend forecast $($T$1)$ of $1\mathrm{.}00,$ and an initial exponentially smoothed forecast $($F$1)$ of $30\mathrm{.}00.$

b$)$ Calculate the mean absolute deviation $($MAD$)$ for each forecast. Which is best?