The key difference between markup $\%$ and margin $\%$ is:

Question $1$Select one:

a$.$

The denominator for markup $\%$ is COGS $($ex$-$GST$),$ whereas for margin $\%$ it is sale price $($ex$-$GST$)$

b$.$

Markup is used by industry, whereas margin is only used by pointy$-$headed academics at universities

c$.$

Markup $\%$ uses GST$-$inclusive price in the denominator, whereas margin $\%$ uses ex$-$GST price

d$.$

There is no difference $-$ they are just different terms for the same thing

e$.$

The denominator for margin $\%$ is COGS $($ex$-$GST$),$ whereas for markup $\%$ it is sale price $($ex$-$GST