Answer and Explanation:
The answer given in the question are not correct. Following should be the choices:
A: 6.5%
B: 7.4%
C: 3.8%
D: 4.6%
The correct answer is A. 6.5 %
The reason is:
3.5% x 1.1% = 4.6%
3.5% + 3.9% = 7.4%
It has to be in between this which is,
4.6% < 6.5% < 7.4%