The true discount on a bill due 9 months hence at 16% per annum is Rs. 180.The amount of the bill is  Choose the correct option.
A) 1200 B) 1764 C) 1680 D) 1354 E) none of these

Rationale: "explanation : let p . w . be rs . x . then , s . i . on rs . x at 16 % for 9 months = rs . 180 . x ã — 16 ã — ( 9 / 12 ) ã — ( 1 / 100 ) = 180 or x = 1500 . p . w . = rs . 1500 . sum due = p . w . + t . d . = rs . ( 1500 180 ) = rs . 1680 . answer : c"
Answer: C