Netzone Company is in semiconductor industry and fabrication of silicon$-$wafer chips splits off two types of memory chips, Standard and Premium. The following information was collected for last quarter of the calendar year:

$\backslash$table$[[$Direct materials processed:,$400kgs($Both standard and premium chips weigh $20$ grams each$),],[$Production:$,$Standard,$13,000$ chips$],[,$Premium $7400$ chips,$],[$Sales:$,$Standard $12,600$ at $$190$ per chip,$],[,$Premium $7000$ at $$240$ per chip,$]]$

The cost of purchasing $400kgs$ of direct materlals and processing it up to the split$-$off point to yleid a total of $20,400$ chips of good products was $$2,020,000.$ Beginning inventorles totalled $130$ chips for Standard and $60$ chips for Premium. Ending inventory amounts reflected $130$ chips of Standard and $60$ chips of Premium. October costs per unit were the same as November. What are the physical$-$volume proportions for products Standard and Premium, respectively?

A$)63\mathrm{.}73\%$ and $36\mathrm{.}27\%$

B$)50\mathrm{.}00\%$ and $50\mathrm{.}00\%$

C$)66\mathrm{.}33\%$ and $33\mathrm{.}67\%$

D$)64\mathrm{.}29\%$ and $35\mathrm{.}71\%$