ANSWER ALL AND EXPLAIN

Iron Decor manufactures decorative iron railings. In preparing for next year's operations, management has developed the following estimates: Compute the following items: Unit contribution margin(show work) Contribution margin ratio(show work) $1.50 Break-even in dollar sales (show work) If the sales volume increases by 20% with no charge in total fixed expenses, what will be the change in net operating income?( show work) If the per unit variable production costs increase by 15%, and if fixed selling and administrative expenses increase by 12%, what will be the new break-even point in dollar sales? ( show work)