A "point" is 1% of your borrowed amount on a mortgage. You want to pay 2 points to get a 0.5% reduction in your interest rate on a $175,000 mortgage. How much will you pay in points?
You are simply asking for the equivalent of 2 points for the mortgage of $175,000. Since 1 point is equal to 1% of the mortgage, 2 points is 2% of the mortgage then.