Find the annual straight$-$line and double$-$declining$-$balance rates $($percents$)$ of depreciation

and the sum$-$of$-$the$-$years'$-$digits fraction for the first year for each of the following estimated

lives.

Life

Straight$-$Line

Double$-$Declining$-$

Sum$-$of$-$the$-$Years'$-$

$4$ years

$5$ years

$8$ years

$20$ years

Solve the following application problems. Round to the nearest dollar.