The packing efficiency of a metal in simple cubic lattice is?

$Packing\; efficiency\; can\; be\; found\; out\; by\; deviding\; volume\; of\; one\; sphere\; with\; total\; volume\; of\; unit\; cell.$

$For\; simple\; cubic\; lattice\; the\; value\; is\; 52.4\%$