Incorrect Question 42 0/2 pts Suppose that you plan to invest $1200 at the end of each of the next 9 years and you want to have accumulated $15,600 at the end of this period. What rate of return would you need to achieve? (Hint: this is what I called an A=BxC problem in which you know A and B.) O 8% 09% 10% 11% 12%