Machine A and machine B are each used to manufacture 440 sprockets. It takes machine A 10 hours longer to produce 440 sprockets than machine B. Machine B produces 10 percent more sprockets per hour than machine A. How many sprockets per hour does machine A produces?  Pick
A) 5	B) 6	C) 4	D) 3	E) 2
Machine B: Takes x hours to produce 440 sprockets   Machine A: Takes (x+10) hours to produce 440 sprockets   Machine B: In 1 hour, B makes 440/x sprockets   Machine A: In 1 hour, A makes 440/(x+10) sprockets   Equating:   1.1(440/(x+10)) = 440/x   484/(x+10) = 440/x   484x = 440x+4400   44x = 4400   x = 100   A makes   440/(110)= 
<gadget id="calculator">  440/(110)</gadget>
<output>4</output>
4 sprockets per hour   Answer : 4
<result>C</result>
Machine A and machine B are each used to manufacture 440 sprockets. It takes machine A 10 hours longer to produce 440 sprockets than machine B. Machine B produces 10 percent more sprockets per hour than machine A. How many sprockets per hour does machine A produces?