Answer:
1) the break even point = total fixed costs / contribution margin = $220,000 / 30% = $733,333.33
2) net income after taxes = before tax income x (1 - tax rate)
$128,000 = before tax income x (1 - 45%)
$128,000 = before tax income x 55%
before tax income = $128,000 / 55% = $232,727.27
3) when total revenue = $733,333.33, net income = $0
so we must add $232,727.27 of contribution margin to $733,333.33:
contribution margin = revenue x 30%
revenue = $232,727.27 / 30% = $775,757.58
total revenue = break even + additional revenue = $733,333.33 + $775,757.58 = $1,509,090.91
4) will remain the same, income tax rate only taxes net income, and at the break even level net income = $0