Which famous calculator company completely redesigned their flagship product in the 1970s based on the Golden Ratio (φ ≈ 1.618), claiming it improved user experience by making button placement 'mathematically intuitive'?

Mathematics and marketing might seem like distant cousins, but when it comes to product design and retail strategy, numbers play a crucial role. From the perfect angles in logos to the mathematical algorithms powering recommendation systems, math is everywhere in the product world. Test your knowledge about how mathematics has influenced some of the most successful product designs and retail strategies in history!

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Texas Instruments with their TI-30 series
Casio with their fx-7000G graphing calculator
HP with their HP-35 scientific calculator
Sharp with their EL-8 electronic calculator