A dishonest grocer professes to sell pure milk at cost price but he mixes it with adulterated fat an...........

Quantitative Aptitude (CDS) Mixture and Alligation

A dishonest grocer professes to sell pure milk at cost price, but he mixes it with adulterated fat and thereby gains 30%. Find the percentage of adulterated fat in the mixture assuming that adulterated fat is freely available.

40%

25%

21%

10%

Explanation:

Cost of adulterated fat = Rs.0
Cost of pure milk = Rs.100
The average cost of the mixture to get a 30% profit by selling at CP = Rs.70
Therefore, the ratio of mixing required would be
= 100-70 / 70 – 0
= 3/7
which means that the percentage of adulterated fat would be 21% .