Hi Heseraj,
By definition, "profit" is the DIFFERENCE between the 'cost' of an item and the 'sell price' of the item. For example, if an item costs you $10 and you sell it for $12, then the profit is...
(Sell price) - (cost) = $12 - $10 = $2 of profit
Since there are two 'pieces' to this equation, you can increase the profit on an item by EITHER raising the sell price OR lowering your initial cost.
In this example, if you increase the sell price to $13, then you can increase the profit...
$13 - $10 = $3 of profit
You could achieve the same level of profit if you could decrease the initial cost (if the initial cost was just $9 instead of $10)....
$12 - $9 = $3 of profit
Beyond the sale of one item, you can also increase OVERALL profit by increasing the number of items sold (at a given profit margin).
GMAT assassins aren't born, they're made,
Rich