A prospector finds a solid rock composed of granite (ρ= 2650 kg/m3) and gold. The volume of the rock is 3.95 multiplied by 10-4 m3 and its mass is 4.14 kg.
1. What percentage of the rock is gold by mass?
2. What mass of gold is contained in the rock?
3. What percentage of the rock is gold by volume?