1.85 g sample of an arsenic-containing pesticide was chemically converted to $\text{AsO}_4^{3-}$ (atomic mass of As = 74.9) and titrated with $\text{Pb}^{2+}$ to form $\text{Pb}_3(\text{AsO}_4)_2$. If 20 mL of 0.1 M $\text{Pb}^{2+}$ is required to reach the equivalence point, the mass percentage of arsenic in the pesticide sample is closest to