If you are referring to a cylinder then:
r = 19.05/2 = 9.525mm
V = pi*9.5252*1.55 = 441.78 mm3
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155 faerie in height
From the US Mint's website: a penny is 1.55 mm thick and 19.05 mm in diameter. So if you stack 100 of them, the 'length' of the stack will be 155 mm (6.1 inches). If you lay them flat, touching, then it would stretch as long as 1905 mm (75 inches - just over 6 feet).
You can calculated reduced volume by getting the starting volume and subtracting it from the finished volume For example, If I had 890ml of water and I had 155ml left, How much has the volume reduced by. 890 - 155 = 735. So the answer would be that the water has been reduced by a total of 735ml.
4% of 155 = 4% * 155 = 0.04 * 155 = 6.2
31% of 155 = 31% * 155 = 0.31 * 155 = 48.05