weatherboards exercise 3 ( claddings and linings book)

specification

wall height: 2700 high
window 1&2:1200 high
window 2,3&4:1100 high
window 6: 950 high
covereage of weatherboard: 205
allow 7 percent waste
cost of board is $2.20 per meter

step 1.
perimeter
9.690+5.908*2=114.497
step 2
gross area
114.497*2.700=309.141
step 3
total area of openings
1.8+1.89+1.32+1.32+1.98=8.31
ste4
nett area of walls
309.141-8.31=300.831
step 5
find coverage of boards
300.831/.205=1467.468
step 6
find meters of boards
1467.468/0.205=7158.38
step 7
add waste factor
7158.38*7percent+=7654.46
step 8
total cost of boards
7659.46*2.20=$16,850.82