And no the answer is not 100. In the above examples I deliberately refrained from using brackets and notice how ambiguous at least for a novice the calculations become. BODMAS and PEMDAS and the other similar acronyms represent an order where multiplication and division are the same step as with addition and subtraction.
In mathematics the order of operations is represented as BODMAS or PEMDAS.
In this acronym the B stands for brackets what we in the US call parentheses and the O stands for orders or exponents. Furthermore in Canada they also call parentheses brackets and their version of PEMDAS is BEDMAS. For example in Great Britain PEMDAS is called BODMAS because they call their operations Brackets Orders Divisions Multiplications Additions and Subtractions. Sometimes BODMAS is just PEMDAS by another name.