After decreasing 80% in the price of an article costs Rs.320. Find the actual cost of an article? Choose the correct option.
A) 2777 B) 2987 C) 1200 D) 9977 E) 1600

Rationale: "cp * ( 20 / 100 ) = 320 cp = 16 * 100 = > cp = 1600 answer : e"
Answer: E