Answer:
21.50
Step-by-step explanation:
Let C = cost before markup
1.25 C = 26.88
C = 26.88/1.25 = 21.50
choice 3) 11,488.21 cm³
r= 28/2 = 14
volume = 4/3πr3 = 4/3(3.14)(14³) = 11,488.21 cm³
B. -21a-15
Step-by-step Explanation: