You made a mistake in calculating your monthly payment. This is the formula you would use to calculate the monthly payment:
N=30*12; R=0.055/12;PV=144000; PMT=PV*R*((1 + R)^N) / ((1 + R)^(N) - 1)
MORTGAGE PMT =$ 817.62 -monthly
$817.62 x 360 months ==$294,343.20 - principal + interest paid over 30 years.
$294,343.20 - $144,000 principal==$150,343.20 - total interest paid over 30 years.
Balance of the mortgage after 10 years==$118,859.03
House equity after 10 years ==180,000 - $118,859.03 ==$61,140.97
If the mortgage payment was: $817.62 + $100==$917.62 - the mortgage would be paid off in 278 months==23 years and 2 months. So, the mortgage would be paid off some 82 months earlier, or about 6 years and 10 months earlier.