Please explain how i can calculate when the volume is increased or decreased.

Total+ Per Unit Sales (30,000 batteries)~ $300,000 $10 ~ Less variable expenses ~ $180,000~ $6 --4-- Contribution Margin $120,000 ~ $4 + A_ Fixed expenses~ $100,000 ~ t Net operating income* $20,000 ~ Required:~ Prepare Aladin's new income statement under each of the following conditions:" 1. The sales colume increase by 15%.~ 2. The selling price decreases by 20% per unit, and the sales volume increase by 30%.~ 3. The selling price increases by 50% per unit, fixed expenses increase by $20,000 and the sales volume decreases by 5%.~ 4. Variable expenses increases by 20% per unit, the selling price increase by 12%, and the sales volume decrease by 10%.~