The electronics store sold 327 televisions this Black Friday and might sell 50 more televisions the next year, for a total of 327 + 50 = <<327+50=377>>377 televisions.
The second year they might sell 377 + 50 = <<377+50=427>>427 televisions.
The third year, if they continue to sell 50 more televisions than they did the previous year, they will sell 427 + 50 televisions = <<427+50=477>>477 televisions on the Black Friday three years from now.
#### 477