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 option.
A) 220
B) 400
C) 500
D) 560
E) 590
N * 50 = (320000 - 300000)= 
<gadget id="calculator">(320000 - 300000)</gadget>
<output>20_000</output>
20000   N= 20000 / 50= 
<gadget id="calculator">20000 / 50</gadget>
<output>400</output>
400   400
<result>B</result>
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?