How to solve this problem

First you need to find the area of each pie. Area of a circle is pi times the radius squared. The radius of a 12" ($8) pie is half the diameter, or 6", squared is 36" sq. Pi times 36 is approximately 113 sq. inches. To find the price per square inch, divide the price by the area (8 / 113 = approximately $.07). The 16" ($10) pie has a radius of 8. Pi times 64 is approximately 201 sq. inches. The price per square inch is 10 / 201 or approximately $.05 per inch.