Gayathri has RM5,000 now in her investment account. She wishes to have RM8,000 in her account after 9 years, but she was informed by the investment firm that she will have RM7,000 in her account in 8 years, what is the interest rate per year she gains from her account?

Select one:

a. 6.05%

b. 5.31%

c. 4.30%

d. 3.81%