The cost of a single ticket depends on the number of tickets, t, purchased in a group, as represented by the function C(t).

C(t) = StartLayout Enlarged left-brace 1st row 1st column dollar-sign 18.50 2nd column 1 less-than-or-equal-to t less-than 12 2nd row 1st column dollar-sign 16.00 2nd column 12 less-than-or-equal-to t less-than 20 3rd row 1st column dollar-sign 14.50 2nd column 20 less-than-or-equal-to t EndLayout

What is the total cost for 20 tickets?

$14.50
$16.00
$290.00
$320.00

The total cost for 20 tickets would be $290.00.

Since 20 is greater than or equal to 20, we would use the third row of the function which states that the cost per ticket is $14.50.

Therefore, the total cost for 20 tickets would be 20 x $14.50 = $290.00.