A Planet Is Made of Two Distinct Materials in Two $\times$

Multiple Choice

A planet is made of two distinct materials in two layers.From the core to R/2,the density of the material is 4000 kg/m³,and from R/2 to R the density is 3000 kg/m³.What is the mass of the planet if R = 5000 km?

A) 2.62 $\times$ 10²³ kg
B) 1.37 $\times$ 10²⁴ kg
C) 1.64 $\times$ 10²⁴ kg
D) 1.57 $\times$ 10²⁴ kg
E) 1.87 $\times$ 10²⁴ kg