Determine whether the sequence is geometric. If so, find the common ratio. $9,15,21,27,\dots$

A) 9
B) 15
C) $\frac{5}{2}$
D) 6
E) not geometric

Brad Pham works as a department manager in a computer products store. One particular fax machine sells for $212.40. Management told Pham that the markup on this fax machine was 45% based on selling price. Calculate the cost of the machine.