Bank $100
bet 1) $60 Remainder $40
win $2.50 return $60x$2.50=$150
$150+$40=$190
60% of $190=$114

bet 2) $114 Remainder $76
win $2.00 return $114x$2.00=$228
$228+$76=$304
60% of $304=$182

bet 3) $182 Remainder $122
win $1.50 return $182x$1.50=$273
$273+$122=$395

This could continue for as long as you wanted....if at any time you backed a loser you would just start with your remainder.
For example if the second bet was a loser you would split $76 in a 60%/40% your next bet would be $45 with remainder of $31
hope that clears it up