QUICK PLEASE Which expression is equivalent to 45−20s ? 25−s B 5(9−4s) C s(45−20) D 5s(9−4)
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Easy, use these two formulas, to find Markdown:
Markdown=Original-New
and
Markdown%=
So, plug in what you know.
Markdown= $30-$20.10
M=$9.90
Now, Markdown%
Markdown%=
M%=0.33*100
M%=33
Thus, there was a 33% markdown.
Markdown=Original-New
and
Markdown%=
So, plug in what you know.
Markdown= $30-$20.10
M=$9.90
Now, Markdown%
Markdown%=
M%=0.33*100
M%=33
Thus, there was a 33% markdown.
We'll solve this equation in order to find the score of the 4th test, which we denote with x. 
. Solving it we find that x=63. And it is the final answer for this problem.