$2\mathrm{.}54$ As shown in the table below, Charlotte's mother and father have experienced decreasing revenues from their business, Thompson's Print and Gift Shop, over the last $8$ years due to the increased use of digital media and e$-$commerce purchases. Determine the following for Charlotte's parents at $i=8\%$ per year using the method$($s$)$ identified in each part.

$($a$)$ Equivalent annual revenues for each of the $8$ years by factor and spreadsheet.

$($b$)$ The equivalent current value $($year $8)$ of the recorded revenues.

$\backslash$table$[[$Year$,1,2,3,4,5,6,7,8],[$Revenue$,$ $$1000,200,195,190,185,180,175,170,165]]$