O
R
^
c
m
h
=
Σ
a
i
d
i
n
i
Σ
b
i
c
i
n
i
=
10
(
465
)
600
+
36
(
175
)
400
90
(
35
)
600
+
164
(
25
)
400
=
7.75
+
15.75
5.25
+
10.25
=
1.52
Description:
Math equation.