The best and most correct answer among the choices provided by your question is all of the above.
All of the institutions in the given employ scientists.
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Stephanie's marginal tax rate is 15%.
<u>Explanation:</u>
The Average tax rate is 8%
she pays $3.75 as the tax on $25 which makes tax rate at this point =3.75/25
= 15%
The Marginal tax rate is the percentage of income that has to be paid as tax as a result of a change in the income bracket.
For instance, if tax rate until $1-$1000 is 10%
and for $1000 and above is 20%.
So for every $ earned over and above $1000.The marginal tax rate for that sum is 20%.
Alcohol is most effective when used as a 70% solution.