a) Cost of item = 55(.79) = 43.45, 43.45(.87) = $37.80
b) TC = 37.80(3000) = $113,400
c) Regular selling price (55% markup) = 37.80(1.55) = $58.59
d) Sale Price after the first markdown = 58.59(.70) = $41.01
e) TS = $58.59(.70 x 3000) + $41.01(3000-2100-40) + $20(40) = $123,039 + $35,268.60 + $800 = $159,107.60
f) `(159107.60 - 113400)/113400 = .403`
Average % markup based on selling price is 40.3%