http://www.math.com/students/calculators/sourc e/basic.htm
Out of sympathy Ive googled a calculator for you.Its for schoolkids so i hope you can manage.Btw don't worry about where you put the batteries whiffy because its all done by computer !!!
Now you subtract 36,000 families ( averaging out at 100,000 now instead of the 50,000 you earlier stated.read back )from 700,000 houses .
And let us know if there will still be a need for this much posted about new town of yours.
Anyways must go, as i really don't want to ridicule you too much ,its no fun when you're such an easy target.
Enjoy whiffy and remember , you cant be wrong all the time , your day will come .
??? HOPE THAT HELPED ??? : O )