Machine A and machine B are each used to manufacture 770 sprockets. It takes machine A 10 hours longer to produce 770 sprockets than machine B. Machine B produces 10% more sprockets per hour than machine A. How many sprockets per hour does machineAproduce?	Choose the correct choice from the following answers
A) 6	B) 6.6	C) 60	D) 100	E) 7.7
time taken by B = t   time taken by A = t+10   qty produced by A = q   qty produced by B = 1.1 q   for B: t(1.1q) =770   qt=700   for A: (t+10)(q) = 770   qt+10q=770   700+10q=770   q=7   so A can produce 7/hour.   then B can produce = 7(1.1)=7.7/hour.   7.7
<result>E</result>
Machine A and machine B are each used to manufacture 770 sprockets. It takes machine A 10 hours longer to produce 770 sprockets than machine B. Machine B produces 10% more sprockets per hour than machine A. How many sprockets per hour does machineAproduce?