Running at the same constant rate, 5 identical machines can produce a total of 270 bottles per minute. At this rate, how many bottles could 10 such machines produce in 4 minutes? Choose the most appropriate option
A) 648
B) 1,800
C) 2,160
D) 10,800
E) 64,800
5 machines produce 270 bottles per minute;   1 machine produces 270/5= 
<gadget id="calculator">270/5</gadget>
<output>54</output>
54 bottles per minute;   10 machines produce 54*10= 
<gadget id="calculator">54*10</gadget>
<output>540</output>
540 bottles per minute;   In 4 minutes 10 machines produce 540*4=2,160 bottles.   Answer: 2,160.
<result>C</result>
Running at the same constant rate, 5 identical machines can produce a total of 270 bottles per minute. At this rate, how many bottles could 10 such machines produce in 4 minutes?