The next TWO questions are based on the following information. Nadia and Robert want to buy a house. They have a combined gross income of $72,000, and can apply $50,000 towards the downpayment of a $200,000 home. They have estimated that the resulting $150,000 mortgage will require blended monthly payments of about $1,350, initially $1,300 of interest and $50 of principal repayment. Their property taxes will be about $250 per month, and they estimate that it would cost an average of another $150 per month to heat the home. They also have an outstanding car loan, which requires payments of $350 per month. What is Nadia's and Robert's gross debt service ratio (GDSR)? a) 29.17%. b) 35.00%. c) 28.33%. d) 26.67%