Question 885565
I was ready to start helping with this , but part of the description does not make sense:  "He fixes the selling price of each article at 20% above the cost price",  and "sells remaining articles, he sells them at 50% of the selling price."


What remaining articles?  No clue given for 50% of the selling price.


TRYING TO MAKE SENSE:
300 articles, spending 1500 Rs. total,
{{{1500/300=5}}} Rs/item, the rate spend, cost per item.
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Fix Selling Price, {{{2/10=1/5}}}, so the Fixed Selling Price is 6 Rs/item.
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Sell Them (which?) at {{{50*percent=1/2}}} of the selling price, so this "sell them" is {{{(1/2)*6=3}}} Rs/item.
That means the selling price IS NOT FIXED. 
If the selling price is fixed, then EITHER it is 6 Rs/item OR 3 Rs/item; NOT BOTH.


TOTAL PROFIT?
Revenue minus Cost.
The problem description must be wrong.