If the price is right

All I do is ,I get my calculator I check every race in each venue .
If the price is right I am in.
I invest $100 on 3 horses,: My return must be, getting my $100 dollars back plus $50 minimum profit.
That’s it. Not all of the qualifying races are winners, but so far I am happy.
Obviously I got few rules I use.
The wins I posted are just hint for some.
Cheers
B