Seth is planning to invest $20,000 of his money. He is investing it in two banks. Seth invested $7,000 in Bank A; which gives an interest rate of 4%. If Seth wants to accumulate $1,280 in interest after one year, what interest rate must Bank B offer for Seth to accomplish this yield? A.9.69%
B.6.69%
C.8.69%
D.7.69%