Sales level at which operating income is zero

oIf sales above breakeven, then profit

oIf sales below breakeven, then loss

oFixed expenses = total contribution margin

Total sales = total expenses

Break Even Point:Unit Sold = Fixed expenses + Operating Income / Contribution Margin per unit.

Break Even Point:Sales $ = Fixed expenses + Operating Income / Contribution Margin Ratio

Calculate the break even sales dollars if the fixed expenses are $7,000 and the contribution ratio is 40%.

(I need the break down and the formula to understand the answer, please)

Thank you