Find the function that gives the literacy rate in terms of t, years after today?

Thanx

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The people of a certain country are working to improve the literacy rate (i.e., the percentage
of the population who can read) among them. Today, the literacy rate is 50%.
Their goal is to increase the literacy rate to 75% in ten years, and after that continuing to
increase the literacy rate indefinitely, ultimately getting closer and closer to 100%.
Suppose that the literacy rate is a linear-to-linear rational function of time.

Find the function that gives the literacy rate in terms of t, years after today?

Thank you!
 
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