We firstly need to add up the total amount of fees, which is <em>$2000 + $1600 = $3600. </em>We then minus the $1400 in concessions, giving us $2200.
When this is divided by 5, we get 440 tickets. However, because each ticket comes with a $3 bat, we know we need to earn an extra $1320. To do this, we need to divide this by $2. This is because all of these tickets still come with a $3 bat.
This gives us another 660 tickets. When these are added together you will need 1110 tickets to break even.
He found early methods to make quick money and also discovered probability. His work was ground-breaking, though not always correct. One of his card equations showed a 2/3 chance of winning, but actually only gave 1/5th!