Answer: $2,144
Step-by-step explanation:
1. Add up all the deposits and the savings account: 1,624+600+600+1,000=3,824
2. Multiply 420 by 4 because he spent $420 each week for 4 weeks: 420x4=1,680
3. Subtract 1,680 from 3,824 to find out how much money he has left. 3,824-1680=2,144.
So Stephen's balance is $2,144 at the end of the month.