[kachnuv_ocasek]

But, then that would be 150 * 2000 = 300,000.

[wizzard]

Yes. If we're talking Roman numerals, MM would be 2000, just like XX is 20 -- not 100. This notation makes no sense to me either.

[lowkeykiwi]

Exactly. 1 million in Roman numerals is M with a bar over the top of it.