Merkury:

$N=0,2\cdot {58}^{\frac{2}{3}}=0,2\cdot \sqrt[3]{{58}^2}\approx 0,2\cdot 441,7\approx 88,34$

Wenus:

$N=0,2\cdot {108}^{\frac{2}{3}}=0,2\cdot \sqrt[3]{{108}^2}\approx 0,2\cdot 1122,37\approx 224,5$