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Look at the figure:
The radius r measures 10cm and the radius R measures 20cm. The height h1 measures 15cm and the height h2 measures 25cm. 
When measuring the radii, an error of up to 3% is made. When measuring the heights, an error of up to ±1cm is made. 
Find: 
(a) The approximate maximum percentage error when calculating the surface area. 
b) The approximate relative error in calculating the volume of the body. 
c) If the height of the cylinder were to change from 25cm to 25.2cm and all other measurements remain the same, approximate the approximate relative error in calculating the volume of the body. 
measurements remain the same, approximate the change in area of the cylinder.