A dishonest person wants to make a profit on the selling of milk. He would like to mix water (costing nothing) with milk costing 33 $ per litre so as to make a profit of 60% on cost when he sells the resulting milk and water mixture for 36$. In what ratio should he mix the water and milk?	Choose the correct option
A) 7:15
B) 7:10
C) 7:8
D) 7:4
E) 7:2
First of all, let's consider 1 liter of the stuff he is going to sell --- naive customers think it's pure milk, but we know it's some milk-water mixture. He is going to sell this liter of milk-water for $36.   This $36 should be a 60% increase over cost. Here, we need to think about percentage increases as multipliers.   Using multipliers   (cost)*1.60 = $36   cost = 36/1.6= 
<gadget id="calculator">36/1.6</gadget>
<output>22.5</output>
$22.5   If he wants a 60% increase over cost on the sale of one liter of his milk-water, the cost has to be $22.5   Well, a liter of milk costs $33, so if he is going to use just $30 of milk in his mixture, that's 22.5/33= 15/22 of a liter. If milk is 15/22 of the liter, then water is 7/22 of the liter, and the ratio of water to milk is 7:15. 7:15nswer choice(7:15)
<result>A</result>
A dishonest person wants to make a profit on the selling of milk. He would like to mix water (costing nothing) with milk costing 33 $ per litre so as to make a profit of 60% on cost when he sells the resulting milk and water mixture for 36$. In what ratio should he mix the water and milk?