R
R
^
c
m
h
=
Σ
a
i
(
c
i
+
d
i
)
n
i
Σ
c
i
(
a
i
+
b
i
)
n
i
=
10
(
35
+
465
)
600
+
36
(
25
+
175
)
400
35
(
10
+
90
)
600
+
25
(
36
+
164
)
400
=
8.33
+
18.00
5.83
+
12.50
=
1.44
Description:
Math equation.