how do i calculate the increase and or decrease percent

Clawfora company Comparative Balance Sheet December 31, 2017 and 2016 Increase (Decrease) Increase (Decrease) 2017 2016 Amount Percent (%) 200,000 180,000 20,000 450,000 400,000 50,000 20,700 30,000 -9,300 670,700 610,000 60,700 X X X X 70,000 80,000 -10,000 200,000 250,000 -50,000 270,000 330,000 -60,000. 1000 000 X X X 275,000 200,000 75,000 125,700 80,000 45,700 400,700 280,000 120,700 670,700 610,000 60,700 0000 X X X X Previous