Drinking Coca-Cola

A pie graph has four unequal slices representing favorite soft drink choices by a sample of n people who taste tested four soft drinks. Eight more people join the sample, and three-fourths of them choose Coca-Cola as their favorite soft drink. This result makes the Coca-Cola slice increase to exactly 54% of the total pie graph. How many people were initially in the sample? Explain how you came to your solution.