Henry earns $120 a week from his job. His income increased and now makes $180 a week. What is the percent increase?
Pick:
A) 70 %
B) 60 %
C) 50 %
D) 40 %
E) 30 %

Rationale: increase = ( 60 / 120 ) * 100 = ( 1 / 2 ) * 100 = 50 % . c
Answer: C