Jose invests money into two different mutual funds. During the first year, Fund A earns 4% interest, and Fund B earns 8% interest. At the end of the first year, Jose has earned a total of $668 in interest. Write a linear equation in general form to represent this situation. Let a represent the amount of money invested in Fund A, and b represent the amount invested in Fund B.
a) 0.04a+0.08b=668
b) 0.08a+0.04b=668
c) 0.04a+0.92b=668
d) 0.96a+0.08b=668
