A certain telescope increases the visual range at a particular location from 100 kilometers to 150 kilometers. By what percent is the visual range increased by using the telescope ?	Select the correct option:
A) 30 % B) 33 1 / 2 % C) 40 % D) 60 % E) 50 %

Rationale: "original visual range = 100 km new visual range = 150 km percent increase in the visual range by using the telescope = ( 150 - 100 ) / 100 * 100 % = 1 / 2 * 100 % = 50 % answer e"
Answer: E