(Revenue variances) The manager of a lumber mill has been asked to explain to the company president why sales of scrap firewood were above budget by $2,100. He requests your help. On examination of budget documents, you discover that budgeted revenue from firewood was $37,500 based on expected sales of 1,875 cords of wood at $20 per cord. Further investigation reveals that 1,800 cords were actually sold at an average price of $22. Prepare an analysis of firewood sales and explain what happened.