The "key to the entire operating budget is the? Multiple Choice o Forecast of operating activity o Operating expense budget o O Cash budget o Production purchases budget 8 The operating expense budget of Mountain Top Creations is comprised of the following budget formulas for its fixed and variable selling and administrative expenses Selling expenses $288.000 per year. $18 per unit Administrative expenses $552.000 per year of sales Mountain Top's sales budget includes sales of 5,000 units each month at a price $50 per unit, the budgeted selling expense for August would be Murple Choice o o o o