Subject: mathqa
Question: 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 50 % on cost when he sells the resulting milk and water mixture for 36 $ . in what ratio should he mix the water and milk ?
Option: 
A: 1 : 20
B: 3 : 2
C: 1 : 10
D: 3 : 8
Answer: D