please solve these questions step by step, explain your answer and use easy formulas.

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Required information The Foundational 15 (Algo) [LO5-1, LO5-3, LO5-4, LO5-5, LO5-6, LO5-7, LO5-8] [he following information applies to the questions displayod below] Oslo Company prepared the following contribution format income statement based on a sales volume of 1,000 units (the relevant range of production is 500 units to 1,500 units): Foundational 5-5 (Algo) 5. If sales decline to 900 units, what would be the net operating income? Required information The Foundational 15 (Algo) [LO5-1, LO5-3, LO5-4, LO5-5, LO5-6, LO5-7, LO5-8] [The following information applies to the questions displayed below] Oslo Company prepared the following contribution format income statement based on a sales volume of 1.000 units (the relevant range of production is 500 units to 1,500 units): Foundational 5-6 (Algo) 6. If the selling price increases by $2 per unit and the sales volume decreases by 100 units, what would be the net operating income? Required information The Foundational 15 (Algo) [LO5-1, LO5-3, LO5-4, LO5-5, LO5-6, LO5-7, LO5-8] The following information applies to the questions displayed below.] Oslo Company prepared the following contribution format income statement based on a sales volume of 1,000 units (the relevant range of production is 500 units to 1,500 units): Foundational 5-7 (Algo) 7. If the variable cost per unit increases by $1, spending on advertising increases by $1,850, and unit sales increase by 270 units, what would be the net operating income