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Po = 450,000 - 0.4*450,000 = $270,000 =
Amt. of loan.
P+I=$270,000 * $6.00/$1000 = $1620/mo.
Tot.(P+I). = 1620/mo * 360mo = $583,200
Tot.Int = 583,200 - 270,000 = $313,200