Dana and monica are dog groomers. dana workday is 10 hrs and monica is 8 hrs. they both work 40 hrs a week. monday dana groomed 15 dogs in 10 hrs and monica groomed 10 dogs in 8 hrs. they both earned 12.75 for each dog. asuming that for the rest of the week dana and monica groom the same number of dogs per day, what is the difference between their weekly earnings?