Answer:
I think the answer is 6 percent.
their are 2 easy ways to understand...
12 is multiplied with 1/2 ...
Their is no any other sign of - or +
so 12*1
=12
and,
12/2 =6
or,
12 is first multiplied with 2 then added with 1 again divided by 2 you will get the answer
Let me know if I am right or wrong