Which calculator product innovation in the 1970s disrupted the market by making advanced mathematical functions affordable to the general public?

The evolution of mathematical calculators has transformed how we solve complex problems, from education to engineering. These specialized consumer products have gone through remarkable design iterations and retail strategies over decades. The calculator market has seen fierce competition among brands positioning themselves for different user segments. Test your knowledge about a pivotal moment in calculator retail history that changed mathematics accessibility forever!

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Texas Instruments TI-30, which introduced scientific functions at under $25 when competitors were charging over $100
Hewlett-Packard HP-35, which was the first handheld scientific calculator but remained premium-priced at $395
Casio fx-7000G, which was the first graphing calculator but wasn't released until 1985
Sharp EL-500, which pioneered solar power in calculators but didn't dramatically reduce the price point