Robinson Crusoe produces upper-loop product of $1000. He pays $750 in wages, $125 in interest, and $75

Question:

Robinson Crusoe produces upper-loop product of $1000. He pays $750 in wages, $125 in interest, and $75 in rent. What must his profit be? If three-fourths of Crusoe's output is consumed and the rest invested, calculate Crusoeland's GDP with both the product and the income approaches and show that they must agree exactly.