Which calculator manufacturer was the first to introduce retail mass-market scientific calculators priced under $20 in the 1970s, making advanced mathematics more accessible to students?

The evolution of mathematical calculators dramatically changed how mathematics is taught, learned, and applied. Beyond the classroom, calculators revolutionized retail operations, accounting systems, and business analytics. This trivia question explores a pivotal moment in calculator retail history that transformed the accessibility and affordability of mathematical tools for the general public.

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Texas Instruments with the TI-30
Hewlett-Packard with the HP-35
Casio with the fx-10
Sharp with the EL-500