Answer: $674,020.80
Explanation:
Loan amount: $420,000 - $75,600 = $344,400
Monthly interest rate: 5.2% / 12 = 0.004333
Total number of payments: 30 years * 12 months = 360
Monthly payment: $344,400[0.0043333(1 + 0.0043333)^360] / [(1 + 0.0043333)^360 - 1] ≈ $1,872.28
Total cost: $1,872.28 × 360 ≈ $674,020.80