Kelly and Justin each win monetary prizes on the TV show US Icon. Kelly immediately deposits her money in an account paying 6.1% effective annual interest, while Justin immediately deposits his in an account paying 5.7% effective annual interest. After 6 years, they decide to get married, and discover that they have a total of $67931.80 combined in their two accounts. If the sum of their original prizes was $48000, how much did Justin originally win?