Pam has a gross monthly income of $3,500. She has 51 remaining monthly payments of $220 for a car loan and 102 remaining monthly payments of $95 on her student loans. Pam is looking at buying a house that is selling for $140,000. The insurance and taxes on the property are $110 and $135 per month, respectively. Pam's bank requires a 20% down payment. The bank will approve a loan with a total monthly mortgage payment of principal, interest, property taxes and insurance that is less than 28% of Pam's adjusted monthly income. a. What is Pam's down payment?