workers decided to raise Rs.3 lacs by equal contribution from each. Had they contributed Rs.50 eachextra, the contribution would have been Rs.3.20 lacs . How many workers were they?	Choose the correct choice from the following choices.
A) 220
B) 400
C) 500
D) 560
E) 590

Rationale: "n * 50 = ( 320000 - 300000 ) = 20000 n = 20000 / 50 = 400 b"
Answer: B