The diameter of a planet is about 25,464 mi. the diameter of the planet's moon is about 21% of the diameter of the planet. what percent of the volume of the planet is the volume of its moon?

The diameter of the moon:
25,464(.21)=5,347.44

The radius of the moon:
5,347.44/2= 2,673.72

The volume of the moon:
80,063,834,021.277

The volume of the planet:
8,645,268,763,770.284

80,063,834,021.277/8645268763770.284= 0.009261

0.0092%

Istg idk..if there all the same length there all the same number but use google