The answer can be derived by more than one method. Here is one method.
Step 1: (100% - 40%) * (100% - 10%); convert the % figures to decimals, then
Step 2: 0.6 * 0.9 = 0.54
Step 3: 100% - 54% = 46%; convert the % figure to a decimal
Step 4: Discount = $25.99 * 0.46 = $11.96
Step 5: Net Cost Price = $25.99 - $11.96 = $14.03