Blossom Limited purchased four articulated robots on account on May $1,2024,$ at an invoice price of $$502,000.$ On May $2,$ it paid $$4,000$ for delivery of the robots. A one$-$year, $$5,500$ insurance policy on the robots was purchased on May $3.$ On May $30,$ Blossom paid $$10,000$ for assembly, installation and testing of each robot on a production line. The robots started operating or were ready for use on July $1.$

Blossom estimates the useful life of the robots will be four years or $10,000$ units with a residual value of $$90,000.$ Assume the robots collectively produce the following numbers of units each year: $1,500$ units in $2024$; $3,000$ units in $2025$; $2,300$ units in $2026$; $2,200$ units in $2027$: and $1\mathrm{.}000$ units in $2028.$ Blossom has a December $31$ year end.

Calculate the annual depreciation and total depreciation over the robots' lives using the: $($Round the depreciation cost per unit to $2$ decimal places, es$.25\mathrm{.}51$ and final answers to $0$ decimal places, e$8.5,275.)$

$(1)$ Straight$-$line method

$(2)$ Double$-$diminishing$-$balance method

$3$ units of production met