The daily cost of manufacturing x paperback books at a small printing shop is C
(
x
)
=
2
x
+
250
,
and the number of books assembled in y hours is
x
(
y
)
=
30
y
.
The composition function,
(
C
⋅
x
)
(
y
)
,
identifies the cost of assembled books in a y-hour day. Which mathematical expression represents
(
C
⋅
x
)
(
y
)
?

60
x
+
7500

60 x + 7500

60
y
+
7500

60 y + 7500

60
x
+
250

60 x + 250

60
y
+
250