Hey guys new to this forum, and not real good with math. But i really like it, and hope to get better as time goes on

But heres the problem: A broker invested $24,000 in two mutual funds, one earning 9% annual interest and the other earning 14%. After 1 year, his combined interest is $3,135. How much was invested at each rate?

Can anyone give me a nice forumula i can use for this prob., including an answer? thankyou so much!!