Determine the amount of Earned Income Credit in each of the following cases. Assume that the person or persons is/are eligible to take the credit. Calculate the credit using the formulas.
a) A single person with earned income of $7,354 and no qualifying children.
b) A single person with earned income of $21,000 and two qualifying children.
c) A married couple filing jointly with earned income of $ 27,190 and one qualifying child.