Question 971610
COST:  {{{(2/3)(rupee/orange)*q*(orange)=(2q)/3}}} rupees.


The vendor would expect to sell ALL q of the oranges for some higher price than {{{2/3}}} rupee per orange.   Selling price is then to be 1 rupee per orange.


PROFIT:  some selling price 1 rupee per orange;  value 10 rupees
{{{highlight(q*1-(2/3)q=10)}}}


{{{(1/3)q=10}}}
{{{highlight(q=30)}}}