Which of these mathematical calculation tools had a disastrous product launch with less than 100 units sold in its first year, before eventually revolutionizing both education and business calculations?

The intersection of mathematics and retail has led to revolutionary products that transformed how we work with numbers. Behind today's calculators and mathematical software lies a fascinating history of product launches, some successful and others forgotten. This poll tests your knowledge about a pivotal mathematical product launch that initially struggled but ultimately changed the industry forever. Can you identify which famous mathematical tool had a rocky debut before becoming ubiquitous?

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Texas Instruments TI-81 Graphing Calculator (1990)
Hewlett-Packard HP-35 Scientific Calculator (1972)
Microsoft Excel Spreadsheet Software (1985)
Casio fx-7000G Programmable Calculator (1985)