Answer is C
Divide 24 by .6 because you know it is 60% of the total then you will get 10% as 4 so when you then times that by 10 to find 100% it comes out to 40. Then 40-24 to find what 40% equals which is 16. Then 16 / (7/8) because you need to get rid of an eighth to find the final answer of 14