q2

a% of veg oil is impure.

% of veg oil that is pure = 100-a

 

b% of pure veg oil is good cholestrol

100-b % of pure veg oil is NOT cholestrol.

 

Let d% of impure veg oil is bad cholestrol.

hence, 100-d % of impure veg oil is not cholestrol.

 

c% of vegetable oil is cholestrol.

So, total volume of cholestrl = c/100

 

This is also equal to good chol. in pure oil + bad chol in impure oil.

So, 

c/100 = (100-a)b/100x100 + da/100x100

 

So, 100c= 100b-ab+ad

ad= 100c-100b + ab

d= 100(c-b)/a + b 

 

Hence this is the percentage of impure oil that is bad cholestrol.