Substitute to Find the Value of the Expression $3 x$ Represents the Amount That Mary Earns Per Week

Substitute to find the value of the expression.
-Mary earns three times as much per week as Maureen. If x represents the amount that Maureen earns per week, then $3 x$ represents the amount that Mary earns per week. How much does Mary earn per week if Maureen earns $\$ 349$ per week?

A) $\$ 1047$
B) $\$ 352$
C) $\$ 116.33$
D) $\$ 346$