Following is the most recent income statement for Ironworks Railroad. Ironworks has no preferred stock.

Sales.......................................................................................... $200,000
Variable operating costs (70% of sales)................................. (140,000)
Gross profit................................................................................... 60,000
Fixed operating costs................................................................ ( 40,000)
Net operating income (EBIT)....................................................... 20,000
Interest expense........................................................................ ( 10,000)
Taxable income............................................................................ 10,000
Taxes (40%)................................................................................... ( 4,000)
Net income..................................................................................... 6,000

a. What is Ironworks’ degree of operating leverage (DOL)?
b. What is Ironworks’ degree of financial leverage (DFL)?
c. What is Ironworks’ degree of total leverage (DTL)?