Do 1/(odds) for each selection

So you would get a total of 0.834 across the 3 selections.

That's a profit of 16.6%.

To make $20 you di $20/0.166 = 120.48

Take the individual percentages and times them by 120.48 and you have your figures:

a)53.54
b)25.10
c)21.90


Make sense ?