[gcb0]

> HP’s own LEDs [...] the calculator needed 15 of them

> Osborne was able to get the price down to a dollar each

> HP typically priced their equipment at the cost of the material list × π [...] the LED display around 20 dollars

uh?

[hinkley]

Probably:

1 Display = 15 LEDs + X additional parts

[janekm]

They mean 15 7-segment LED Display modules (bubble LED displays).