Obra drove 150π meters along a circular track. If the area enclosed by the circular track on which she drove is 57,600π square meters, what percentage of the circular track did Obra drive?	Select the correct option:
A) 6.67 %  B) 12.5 %  C) 18.75 %  D) 25 %  E) 31.25 %

Rationale: area enclosed by the circular track on which she drove is 57,600 π square meters so , π ( r ^ 2 ) = 57,600 π - - - > ( r ^ 2 ) = 57,600 - - - > r = 240 circumference of the circular track = 2 π r = 480 π therefore , part of circumference covered = 150 π / 480 π = 31.25 % hence , answer is e .
Answer: E