If a stone tablet is 50cm in length, 20cm in width and 0.75T in mass, its density is () kg / M cubic?

If a stone tablet is 50cm in length, 20cm in width and 0.75T in mass, its density is () kg / M cubic?

Density = m / V, v = 0.5 × 0.2 × 3 = 0.03 m3, M = 7500kg, 250000