Question: Plotting functions

Have a good day;

Anyone know the correct command to plot functions (For Exact Solution). Here I have attached the file:

Exact.mw

For your information, I need to plot the different values of R in the same graph. The values of R are 

R=0, 0.1, 0.2 and 0.3.

 

Thank you very much in advance. 

May God bless you :)

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