A technician makes a round-trip to and from a certain service center by the same route. If the technician completes the drive to the center and then completes 50 percent of the drive from the center, what percent of the round-trip has the technician completed?	Choose the correct choice from the following answers:
A) 70
B) 65
C) 60
D) 75
E) 80
round trip means 2 trips i.e.to and fro. He has completed one i.e 50% completed. then he traveled another 50% of 50% i.e 25%. so he completed   50 +25= 
<gadget id="calculator">  50 +25</gadget>
<output>75</output>
75 % of total trip.   75
<result>D</result>
A technician makes a round-trip to and from a certain service center by the same route. If the technician completes the drive to the center and then completes 50 percent of the drive from the center, what percent of the round-trip has the technician completed?