Lincoln and Amir are Criston are dog groomers. Lincoln's workday in 10 hours and Criston's workday is 8 hours. Lincoln and Criston each work 40 hours a week. On Monday, Lincoln groomed 15 dogs in 10 hours and Criston groomed 10 dogs in 8 hours. They each earn $12.75 for each dog groomed. Assuming they each groom the same amount of dogs Tuesday, Wednesday, Thursday and Friday, what will the difference be in their weekly earnings?