Using the chromatograms and formulas provided below, what is the quantity of the unknown

sample?

Formulas:

Peak height ratio of standard $=[$peak height of external standard$]/[$peak height of

internal standard$]$

Peak height ratio of unknown sample $=[$peak height of unknown sample$]/[$peak height

of internal standard$]$

Quantity of unknown sample $=([$peak height ratio of unknown sample$]/[$peak height

ratio of standard$])x$ concentration of the standard

Answer Options:

$5mg$

$10mg$

$20mg$

$25mg$