Initial cost for a ticket is $38.31, knowing that it decreases by $0.44 for every game lost, you can multiple that value ($0.44) by the number of games lost to get the total decrease in value. You then can take the initial cost and subtract it from the total decrease.
($38.31) - ($0.44 x 39)
$38.31 - $17.16 = $21.15 after 39 losses
Total change or in this case total decrease was $17.16
