Running at the same constant rate, 6 identical machines can produce a total of 300 bottles per minute. At this rate, how many bottles could 10 such machines produce in 4 minutes?
Options
A) 648  B) 1,800  C) 2,000  D) 10,800  E) 64,800
6 machines produce 300 bottles per minute;   1 machine produces 300/6= 
<gadget id="calculator">300/6</gadget>
<output>50</output>
50 bottles per minute;   10 machines produce 50*10= 
<gadget id="calculator">50*10</gadget>
<output>500</output>
500 bottles per minute;   In 4 minutes 10 machines produce 500*4=2,000 bottles.   Answer: 2,000.
<result>C</result>
Running at the same constant rate, 6 identical machines can produce a total of 300 bottles per minute. At this rate, how many bottles could 10 such machines produce in 4 minutes?