Answer: They can afford to borrow: $300225.
Explanation: We must use the annuity formula in which the monthly interest rate is 0.06 / 12 = 0.005, the payment is 1800, and the n is equal to (12x30 = 360) which are the number of months in 30 years.
1800 × [tex]\frac{(1+0,005)^{360}-1 }{(1+0,005)^{360} . 0,005 }[/tex] = $300225.