I need help with these prarice study questions

QUESTION 1 The amount of a unit's sales price that helps to cover foxed expenses is its O contribution margin profit O vanable cost stepped cost QUESTION 2 Acompany's product sells for $150 and has vanable costs of $50 associated with the product What is its contribution margin ratio? O 60% O 10% O 40% O 90% QUESTION 3 A company sells its products for $80 per unit and has per-unit variable costs of $30 What is the contribution margin per unit? $50 O $30 O S80 O $110 QUESTION 4 A company has pre-tax or operating income of $120.000 If the tax rate is 40% what is the company's after tax income? 72,000 O 300.000 O 240,000 48 000 QUESTION 6 When fixed costs decrease and all other variables remain unchanged the break even point will decrease increase O remain unchanged produce a lower contribution margin