An ideal ionic crystal is having rock salt structure $\left(A^{+}{B}^{-}\right)$ such that $A^{+}$ is occupying octahedral void. The crystal is doped with atoms of C which occupy all the tetrahedral voids without distorting the lattice. If the crysta1 shows defect such that the body centered atom is missing then calculate fraction of body diagonal covered by species in the defective crystal. $[\text{ Use : }\sqrt{1.5}=1.2]$

[Express your answer by multiplying the fraction by 10]