please help me in explaining the attached question in steps

4 ) A firm sold 1 12 009 units of product for $3 97 6 009 . The contribution margin per unit was $18.50 and the fixed costs were $1 675 000 Required : 1 ) break even in units and dollars . 2 ) If management wants to earn $500 ,000 in income - how many units must be sold ? 3 ) Underth der the opening scenario - what is the operating leverage and 4 ) the margin of safety in units and percentage ? ! 5 ) A sales manager wants to increase the selling price to $37 , while units sold Se to 107 000 . The firm would increase advertising expen ! Id increase Id would income ? 6 ) A manufacturing engineer wants to 8 expense by $85 000 . Does the firm Increase e ? 6 ) A manufacturing engineer wants to automate part of the production line by increasing fixed costs by $185 000 , but the variable cost would decrease to $15 per unit . Unit sales stay at 12 000 . Does the firm increase income