The rectangle with 6 rows has 30 people in the whole rectangle. The rectangle with 9 rows has 45 people.
6 x 5 =30
9 x 5 =45
30+45 =75 people
8.5/10 or 85/100 is fraction from. Estimated just round it
A^2+B^2=C^2
6*6+6*6 = sqrt(72) so... 8.49 blocks in a Northwest Direction
Original cost -total cost to get amount of tax.
This is non linear
Because it is not a straight line