WjW@vZ

K ѐ
T 25 15~
U 25 25~
V 25 40~
W 25 80~
v 100 @

@{A(160 x 100) 2 8,000

Aa + b + c + d = 5,375

a 25 x 15 2187.5
b(15+40) x 252687.5
c(40+80) x 2521,500
d(80+160) x 2523,000

@8,000 - 5,3752,625

WjW2,6258000 = 0.328125