please help with all 3 problems i'm having difficulty!

Required information [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): 5. If sales decline to 900 units, what would be the net operating income? (Round "Per Unit" calculations to 2 decimal places.) Required information [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): 6. If the selling price increases by $2 per unit and the sfles volume decreases by 100 units, what would be the net operating income? (Round "Per Unit" calculations to 2 decimal places.) Required information [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): 7. If the variable cost per unit increases by $1, spending on advertising increases by $1,350, and unit sales increase by 170 units, what would be the net operating income? (Round "Per Unit" calculations to 2 decimal places.)