In 2000, mobile handset sales totaled $414.99 million. In 2005 the total was $778.75 million.  Let M=M(t) denote total mobile handset sales in year t.  What was the average rate of change per year in M(t) from 2000 to 2005? (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.