The total revenue for Saturday and Sunday is $1917.50
We know that 815 tickets were sold on Saturday, and on Sunday the number of tickets sold decreased by 96.
Then the total number of tickets sold in the two days is:
(815) + (815 - 96) = 1534
And we know that each ticket costs $1.25
Then the total revenue is:
R = $1.25*1534 = $1917.50
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