Which innovative pricing strategy did GeoGebra implement in 2015 that led to a 300% increase in institutional adoption of their advanced mathematics visualization software?

Pricing strategies in mathematical educational products have evolved significantly over the years. Publishers and developers of math learning tools use various approaches to maximize both accessibility and profitability. This trivia question explores how one major mathematics educational software company revolutionized its pricing model to dramatically increase market penetration in academic institutions while maintaining revenue growth.

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Freemium model with tiered institutional licensing based on mathematical complexity levels
Dynamic pricing algorithm that adjusted costs based on the mathematical curriculum complexity of each institution
Pay-per-problem model where institutions were charged only for specific mathematical concepts utilized
Fibonacci-sequence based pricing where costs increased according to the mathematical sequence for each additional user license