Empower + Vulnerable + Swarm etc damage stacking question

[Synn the Underwhelming]

What is the damage dealt by a spell that is empowered hitting a vulnerable creature?

Example: Empowered fireball vs fire vulnerable ice creatures?

Example2: Empowered fireball vs fire vulnerable swarm ice creatures?

Thanks in advance! :-)

[Quantum Steve]

PRD wrote:

Multiplying Damage: Sometimes you multiply damage by some factor, such as on a critical hit. Roll the damage (with all modifiers) multiple times and total the results.

Note: When you multiply damage more than once, each multiplier works off the original, unmultiplied damage. So if you are asked to double the damage twice, the end result is three times the normal damage.

Exception: Extra damage dice over and above a weapon's normal damage are never multiplied.

Example 1: 200% damage

Example 2: 250% damage