Answer:
86.4%
Explanation:
the original marked price is m
then with a sales discount of 20%
the (pre-sales tax) sale price is 100%−20%=80% of
The post-sales tax price is the pre-sales tax price plus 8%,
that is the post-sales tax price is 108%=1.08 of the pre-sales tax price.
Therefore the final cost (i.e. the post-tax price) is
