Show correct steps, math, and reasoning.

6. Do percentage change analysis on the following income statement, and explain the potential reasons for the decrease in net income. Income Statement (Thousands of dollars) Sales Operating costs excluding depreciation EBITDA Depreciation & Amortization EBIT Interest expense EBT Taxes (21%) Net income 2015 $455,000 $386,050 $68,950 $6,700 $62,250 $8,050 $54,200 $11,382 $42,818 2014 $365,000 $290,000 $75,000 $6,500 $68,500 $4,000 $64,500 $13,545 $50,955