please check my answer

Question

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The monthly payment on a $90,000 mortgage at a rate of 7.5% interest for 30 years is $630.00

Answer 1

Using
http://www.hsh.com/cgi-bin/flap.cgi?prin=90000.&int=7.50&term=30&strt=Jan&stry=2007&full=No&ppay=0&apay=0&pay1=0&ppno=0

I get $629.29

Your answer of $630 is the nearest whole-dollar amount that will pay it off in 30 years or less. At that rate it might be paid off a month or two early