For 2015, Beatrice qualifies for the earned income credit. She has a daughter who is 7 years old. Her earned income and adjusted gross income for 2015 are $6200.

a) Calculate the amount of her 2015 earned income credit

b) Calculate the amount of Beatrice's 2015 earned income redit assuming her earned income for 2015 is $8500 and her adjusted gross income is $10,000.