If the selling price of an article is Rs.240, the profit is 20%, then for how much should it be sold, if the profit is to be 30%?
profit %= $$ (sp-cp) \div cp $$
sp=selling price cp=cost price
for 20% profit, sp=240
$$ 20 \div 100=(240-cp) \div cp $$
on solving we get cp=200
if profit is to be 30%, then we need to find out sp=?
$$ 30\div 100 =(sp-200) \div 200 $$
solving we get sp=260
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