Two formulas that approximate the dosage of a drug prescribed for children are DA A + 12 Young's Rule: C=- Cowling's Rule: C = and D(A + 1) 24 where A is the child's age in years, D is the adult dosage, and C is the child's proper dosage. For a 3-year-old child, what is the difference in the dosage given by Cowling's rule and Young's rule? Express the answer as a single rational expression in terms of D. Then describe what your answer means in terms of the variables in the models. Last, what are the child's dosages in each model if the adult dosage is 1000mg?