A milk vendor purchased some milk at the rate of $7.50 and after mixing 30% of water to it sold the mixture at the cost price. His profit per cent is.
A. 30%
B. 3%
C. 25%
D. 60%
E. None of these

• consider milk to be 100 litre
  purchased rs 7.50--->100
  after adding 30% 7.50--->130
  cp of 1l=100/7.50=13.33, sp pf 1 l=130/7.50=17.33
  (sp-cp)/cp *100 =(4/13.33)*100=30%
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