Integrated Reasoning (IR) | Re: Integrated Reasoning : Two part analysis

1. 2πr=5.50
=> r = 5.5/2π = 5.5/2x3.14 = .875
So surface area = 4πr^2= 4x3.14x .875^2 = 9.61 m^2
Hence cost = 9.61x92 = 885 ~ $900
2. 2πr=7.85
=> r = 7.85/2π = 7.85/2x3.14 = 1.25
So surface area = 4πr^2= 4x3.14x 1.25^2 = 19.625 m^2
Hence cost = 19.625x92 = 1805 ~ $1800