Aqueduct Grand Slam

[jcs11204]

Played my first ever grand slam today

$20- 5/10/3/5
i have the first 2, and there have been some bombs underneath, but also the favorites have all been on the board. how do they calculate this wager ? i have never played it before, and never followed it, my friend loves it though, he plays it 1-1-1-1 for 20 bucks everyday, the other day he turned no reply into a 33 doller horse, with a grand slam, i think he has talked me into liking the bet.