Answer:I did the calculations and i believe i got it right.
Explanation:
Mercury sold 500 tickets at $40 a piece, okay, still with me, good. Yet, only 450 tickets were used during the month. What that mean is to minus 50 tickets. 50 multiplied by $40 is $2000. 500 multiplied by $40 equals to $20000. $20000 minus $2000 is equaled to $18000. They also had a Unearned Revenue account that had a credit balance of $5000. So, that means they should be in "debt." They should have $-15000. Add $2000, it is equaled to $-13000. So it should be $-13000. If wrong, i'm sorry.