If an entity employs the sum$-$of$-$the$-$years'$-$digits $($SYD$)$ method of depreciation for an asset with an estimated useful life of $4$ years, the percentage of the total depreciable cost that will be expensed in the third year is

$0\mathrm{.}10$

$0\mathrm{.}25$

$0\mathrm{.}20$

$0\mathrm{.}70$