Microsoft's stock price peaked at 6118% of its I.P.O. price more than 13 years after the I.P.O.† Suppose that $20,000 invested in Microsoft at its I.P.O. price had been worth $1,200,000 (6000% of the I.P.O. price) after exactly 13 years. What interest rate, compounded annually, does this represent? (Round your answer to two decimal places.)

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Differential Equations

Have you ever observed the movement of the satellites and rockets or how the planets go around the sun in their orbits? How will you determine their motion? Definitely they follow some scientific laws and these kinds of problems are framed as differential equations.