Answer:
27. C
28. D
Step-by-step explanation:
The average of all grades in his fencing class, including the upcoming one, (all grades summed up divided by the amount of grades) must be equal to 86 (percent), hence C is the right answer for 27.
Solving this equation gives:

So D is the right answer for 28.
190.5 / 62 = x / 100
19050 / 62 = 307 if you round
It is B 80. Because it is 40 x 2 = 80. Hope thishelped
The markup will be $3.15
You will be paying 105% which is 1.05 as a decimal.
The you multiply. 3 × 1.05 = $3.15
the answer to that question is 6000