Kimberly wants to invest $3,000 in an account that earns 4% annual interest, and x dollars in an account that earns 7%, so that, on average, she earns 5.5% interest for both accounts. Select the equation to model the situation. A. 0.04(3,000) + 0.07x = 0.55x
B. 0.055(3,000 + x) = 120 + 0.07x
C. 0.04x + 0.07x = 3,000
D. 0.055(3,000) = 0.04x + 0.07x