A hard water contains $96\mathrm{mg}$ of $\mathrm{Ca}{}^{2+}$ and $28.8\mathrm{mg}$ of $\mathrm{Mg}{}^{2+}$ per litre. Each divalent ion precipitates two stearate ions as the insoluble stearate. Use atomic masses Ca = 40, Mg = 24 and a molar mass of sodium stearate of $306\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$. Calculate the mass of sodium stearate wasted as scum in treating $250\mathrm{L}$ of this water. Give the answer in grams, to the nearest integer.

Numerical answer type, answer in g, tolerance 0.5.