Step-by-step explanation:

1. Difference: 20-10= 10

Percent of change: [10/10]•100=100%

2.Difference: 75-25= 50

Percent of change: [50/25]•100=200%

3.Difference: 24-42= -18

Percent of change: [-18/42]•100= 23.81%

4.Difference: 300-100= 200

Percent of change: [200/100]•100=200%%

5.Difference: 33-89= -56

Percent of change: [-56/89]•100= 62.92%

6.Difference: 500-256= 244

Percent of change: [244/256]•100= 95.31%

7. Difference: 243.25-667= -423.75

Percent of change: [-423.75/667]•100= -63.53%

8. Difference: 673.30-999= -322.7

Percent of change: [-322.7/999]•100= -35.86%

9. Difference: 900-1245.50= -345.5

Percent of change: [-345.5/1245.50]•100= 27.74%

10.Difference: 15,000-2456.30= 12,543.7

Percent of change: [12,543.7/2456.30]•100= 510.67%