please help with area and perimeter. please don't give downloaded answer because my computer has issues with winzip

Answer:
p = 72m
a = 228m^2
Step-by-step explanation:
p = 20 + 12 + 12 + 8 + 6 + 6 + 8 = 72
a = (20 x 12) - ( (6 x 4) / 2) = 240 - (24 / 2) = 240 - 12 = 228