First cost$=$$$80000$

Book depreciation life $=7$ years

MACRS property class $=7$ years

Salvage value $=24000$

$$n$=1-8$ A $=80008000800080008000800080000$

B$=22857163271166151540000$

C$=11429$

$19592$

$13994$

$9996$

$7140$

$7140$

$7140$

$3570$

D$=22857$

$16327$

$11661$

$8330$

$6942$

$6942$

$6942$

$0$

Identify the depreciation method used for each depreciation schedule as one of the following: a$.$ Double$-$declining$-$balance depreciation b$.$ Straight$-$line depreciation c$.$ DDB with conversion to straight$-$line depreciation, assuming a zero salvage value d$.$ MACRS seven$-$year depreciation with the half$-$year convention e$.$ Double$-$declining$-$balance $($with conversion to straight$-$line depreciation$)$