The volume of the cylinder is given by: V = pi * r ^ 2 * h For h = 12cm: V1 = pi * ((21) ^ 2) * (12) V1 = 16625.30832 cm ^ 3 For h = 11.9cm: V2 = pi * ((21) ^ 2) * (11.9) V2 = 16486.76409 cm ^ 3 The change in volume is given by: V1-V2 = 16625.30832-16486.76409 V1-V2 = 138.54423 cm ^ 3 Answer: the change in the volume is: V1-V2 = 138.54423 cm ^ 3
Add all the visitors up which equals 4215.5 and do 236.9 divided by 4215.5 and you get 0.056 which converted to a percentage equals 5.6%. Hope this helps.