Please show your work, I will need to know how to compute this.

For the most recent year, Triad Company had fixed costs of $250,000 and variable costs of 80% of total sales revenue, earned $74,750 of net income after taxes, and had an income tax rate of 35%. Required: 1. Determine the before-tax income. 2. Determine the total contribution margin. 3. Determine the total sales