Please I need help w this question. *Use and show formulas*

1) This St. Patrick’s Day at McGuinnes Pub they plan to sell 225 lbs. of corned beef dinners.
If they were able to purchase the beef for $3/lb. how much did they pay for it in total?

"2) If you want to markup the selling price by 300%, how much do you need to charge per pound of beef?
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3) If they sell all of it at this price, how much revenue, and profit did they make on the beef alone?
Revenue=Total Sales Profit=Sales - Costs