After decreasing 90% in the price of an article costs Rs.320. Find the actual cost of an article? Select.
A) 2777
B) 2987
C) 3200
D) 9977
E) 1671

Rationale: "cp * ( 10 / 100 ) = 320 cp = 32 * 100 = > cp = 3200 answer : c"
Answer: C