Answer:
Jesse's brother total debt limit =$24,750 x 20% = $4,950
his monthly payment should not exceed ($24,750 / 12) x 10% = $206.25
Jesse's sister total debt limit = $35,800 x 20% = $7,160
her monthly payment should not exceed ($35,800 / 12) x 10% = $298.33
the 20/10 rule is a rule of thumb, meaning that it is not exact, it only gives us a parameter.