The down payment is $200,000 on a house with an agreed-upon price (and appraisal) of $1,600,000. Jumbo mortgage rates are 4.3% and conforming rates are 4%. If the conforming loan limit is $800,000 in the area, then the breakeven rate on a second mortgage piggyback arrangement is 5.0% 4.7% 4.6% 4.5% 4.8% 4.9%