Which retailer's strategic pricing decision in 1976 caused a revolution in the calculator market, making advanced mathematics accessible to students worldwide?

The calculator industry transformed mathematics education and professional computation. Behind these powerful devices were strategic retail decisions, innovative marketing campaigns, and brand identities that shaped how we interact with mathematics. This trivia tests your knowledge about a pivotal moment in calculator retail history that changed mathematics accessibility forever.

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Texas Instruments, introducing the TI-30 scientific calculator at $24.95 (one-third the previous price point for scientific calculators)
Hewlett-Packard, launching the HP-25C with continuous memory at $99 (half the price of their previous models)
Casio, releasing the fx-201P programmable calculator at $19.95 (the first programmable under $20)
Sharp, debuting the EL-500 scientific calculator with built-in formulas at $29.99 (the first formula-based calculator)