How much Potential Energy does a 25 kilogram object have if it is on a shelf 3 meters above the floor?

Short answer if you can; 9th grade science.How much Potential Energy does a 25 kilogram object have if it is on a shelf 3 meters above the floor?
P.E=mgh where m=25kg, g=10m/s2 (I assume that g=10, but in some cases, it equal to 9.8), h=3m


P.E=25*10*3


P.E=750 J