If it costs $75,000 to put on an event and total revenue is $135,000, how much profit how much profit did the concert bring in?

The accountant at bramble corp. has determined that income before income taxes amounted to $10800 using the fifo costing assumption. if the income tax rate is 30% and the amount of income taxes paid would be $900 greater if the lifo assumption were used, what would be the amount of income before taxes under the lifo assumption?