$[6]$ Using a GC$/$MS analysis, $0\mathrm{.}0837M$ cocaine gave peak area $A=423$ and

$0\mathrm{.}0666M$ Novocain gave peak area $A=347.$ For the unknown, $10\mathrm{.}0mL$ of $0\mathrm{.}146M$

Novocain was added to $10\mathrm{.}0mL$ drug money extract, and the mixture was diluted

to $25\mathrm{.}0mL.$ This mixture gave $A=553$ for cocaine and $A=582$ for Novocain. $($i$)$

Find the concentration of cocaine in the unknown. $($ii$)$ Is this technique external

standard, standard addition, or internal standard method?