Head wreck! This simple Maths puzzle is driving the internet NUTS

We have to get our phones out when calculating how much something costs in the Topshop sale, and yet there's something about online Maths puzzles that brings out the competitor in us.

No one else can get it, eh? Oh, we'll sort that out fairly lively. (We never sort it out, but whatever.) 

Anyway, the latest one to stump the internet is a four-line puzzle which was posted on Facebook by Randall Jones earlier this week.

There are two possible methods and therefore two possible correct answers, but which is the CORRECT correct one?! 

Is it 40 or 96, ladies? We'll leave you to figure it out…