$($Related to Checkpoint $5\mathrm{.}2)($Future value$)$ A new finance book sold $16,000$ copies following the first year of its release, and was expected to increase by $18$ percent per year. What sales are expected during years two, three, and four? Graph this sales trend and explain how compound growth affects the shape of the sales trend.

a$.$ If the $16,000$ copies of book sales following the first year of its release were expected to increase by $18$ percent per year, what are the expected sales of the new finance book during year two?

$$ copies $($Round to the nearest whole number.$)$