How to calculate with football betting spread formulae?

Question

I was applying football betting spreads formula to calculate the profit margin. But I’m not sure that I’m doing it in right way. Here is my question, if Arsenal scores 4-1 over stoke city then what would be the profit?

Answer 1

Here the betting spread formulae to calculate the profit. As 4-1 is difference of 3 goals and you bought 0.3 with £10 per goals so, 3 goals – 0.3 = 2.8 >> 2.8 x £10/goal = £28. So you will get 18$ profit on 10$ bet