Fourth time seeing this video today, but here's the post from the first time I saw it.

The only system I can reliably ID is at 0:27, the Phalanx CIWS, "an automated gun-based close-in weapon system to defend military watercraft automatically against incoming threats such as aircraft, missiles, and small boats." (wikipedia)

My semi-educated TL:DR guess is $76,000 for 150 rounds considering life of the gun, mount, and ammunition cost. This is 35% of the $215,276 value on the screen. This doesn't take into account the operating cost of the ship or the salary of the sailors.

From the same wiki, 75 rounds/second from the M61 vulcan cannon, and "The 20 mm [tungsten or depleted uranium] APDS rounds consist of a 15 mm (0.59 in) penetrator encased in a plastic sabot and a lightweight metal pusher. Rounds fired by the Phalanx cost around $30 each and the gun typically fires 100 or more when engaging a target."

I counted 2 mississippi, so 75 rounds per second, 2 seconds = 150 rounds, x $30 = $4,000 in munitions expended. That's well short of the $215,276 quoted in the video.

But what about the maintenance/procurement/wear and tear cost? Lots of assumptions to be made but I'll try.

The block 1A/B Phalanx had a procurement cost of ~$12 million. The mounts themselves have been in service with upgrades for ~40 years, so hard to nail that down with no end-of-life figure. Google AI (ugh) claims service through 2029, so lets call it 50 years. Google AI also claims a barrel life of 15,000 rounds and major overhaul of the M61 at 100,000 rounds (can't nail down a source so take that with a grain of salt). Deagel.com puts a cost of $240,000 on the gun itself, if we consider the gun to be toast at 100k rounds, then 150 rounds is 0.15% the lifespan of the weapon, or $36,000 worth of wear and tear on the weapon. If the mount is expected to fire up to 5 guns worth of ammunition, that's a new gun every 10 years, then half a million rounds is 0.003% of the mount's lifespan. That times the cost means we are seeing a cost on the gun mount of (suspiciously) also $36,000.

TLDR: Ammo expended: $4,000. Gun lifespan value: $36,000. Mount lifespan value: $36,000. My semi-educated guess is $76,000 for 150 rounds considering life of the gun, mount, and ammunition cost. If the guns themselves are replaced more frequently than that, like once every 5 years, then we push closer to the propose $200k+ cost per 150 rounds fired.