4/5x3.5+5.5x80%+0.8 \ =0.8x3.5+0.8x5.5+0.8x1 =0.8x(3.5+5.5+1) =0.8x10 =8 0.5x1.25x2.5x64 =(0.5x2)x(1.25x8)x(2.5x4) =1x10x10 =100
