Explanation:
remember : any "dot" operation comes before any "dash" operation.
so, every multiplication or division has to be done before any addition or subtraction is done.
the priority is
1. brackets
2. exponents
3. multiplication and divisions
4. additions and subtractions
for operations on the same level we usually go left to right.
I am not sure what the problem is to keep that in mind.
but it is essential that you do.
so, what you have here is
(8÷0.1 + 12×3) - 2
8÷0.1 = 80
12×3 = 36
80 + 36 = 116
116 - 2 = 114
so, the result is 114.
I hope this helps.