A building acquired at the beginning of the year at a cost of $$2,200,000$ has an estimated residual value of $$400,000$ and an estimated useful life of $20$ years. Determine the following:

$($a$)$ The depreciable cost $fill in the blank $1$

$($b$)$ The straight$-$line rate fill in the blank $2\%$

$($c$)$ The annual straight$-$line depreciation $fill in the blank $3$