I don't know how to do this problem, can you please help me?

In 2016, Amanda and Jaxon Stuart have a daughter who is one year old. The Stuarts are full-time students and they are both 23 years old. Their only sources of income are gains from stock they held for three years before selling and wages from part-time jobs. What is their earned income credit in the following alternative scenarios if they file jointly?

c) Their AGI is $25,000, consisting of $20,000 of wages and $5,000 of lottery winnings (unearned income).

d) Their AGI is $25,000, consisting of $5,000 of wages and $20,000 of lottery winnings (unearned income).

e) Their AGI is $10,000, consisting of $10,000 of lottery winnings (unearned income).