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Zenith TV, giant picture without magnifiers (1949)
(thelemmy.club)
$2.85 in 1949, is about $40 today. So 91 weeks of that, plus the unspecified down payment, would exceed $3600 in today's terms, possibly over $4000.
1949 saw the first episode of the Lone Ranger, which ran 52 episodes that season. The first broadcast of the Emmy awards. The first televised charity telethon, for a cancer foundation.
There were 4 television networks in the USA. ABC, CBS, NBC, and the much lesser known DuMont network, which operated from 1940 to 1956.
On top of what theunknownmuncher@lemmy.world said (weekly over 91 weeks!), there was also a down payment that the ad refers to but does not specify.
And those were 1949 dollars. I'm guessing the whole TV cost would be similar to $4000 in today's dollars, accounting for both inflation, and let's imagine 10% down.
That's pricey! On the other hand, Zenith was a high end prestige brand. Zenith invented the TV remote control (!!), and pioneered stereo over radio broadcasts. They sold one of the first portable radio sets in the 1920's. They were a premium brand, back in the day. So maybe in 1949, less premium models of TV could be found cheaper.