Silas pays 20% of his medical care and 35% of his dental insurance.
To find how much he pays for each insurance we can use the rule of three. For the medical care we have:
[tex]\begin{gathered} 8573\rightarrow100 \\ x\rightarrow20 \\ \text{then } \\ x=\frac{20\cdot8573}{100}=1714.6 \end{gathered}[/tex]For the dental insurance we have
[tex]\begin{gathered} 172\rightarrow100 \\ x\rightarrow35 \\ \text{then} \\ x=\frac{35\cdot172}{100}=60.2 \end{gathered}[/tex]Hence, he pays annually $1774.8
Since the year has 52 weeks he pays $34.13 weekly.