A transformer with an efficiency of 80% is connected to 50-volt alternating current source. The voltage and current in the secondary are 500 Volts and 0.1 Amperes respectively. What is the current in the primary?
A) 0.8 A
B) 1.0 A
C) 1.25 A
D) 1.35 A
E) 1.15 A