Answer:Original value New Value Decrease (Difference of new and old value) Percentage Decrease (amount of Decrease / Original Value x 100%) 100 80 20 20% 180 72 40% 360 144 40% 1230 270 22% 1000 4000 80%Step-by-step explanation:- Decrease: To find the decrease, subtract the new value from the original value.- Percentage Decrease: Divide the decrease by the original value and multiply by 100%. For example, in the first row: - Decrease: 100 - 80 = 20- Percentage Decrease: (20 / 100) * 100% = 20%