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 ## Simple Interest Calculator
 
-A calculator that calculates simple interest given principal, annual rate of interest and time period in years.
+A calculator that calculates simple interest given the principal, annual rate of interest, and time period in years.  
+
 
 ```
 Input:
-   p, principal amount
-   t, time period in years
-   r, annual rate of interest
-Output
-   simple interest = p*t*r
+   P, principal amount
+   T, time period in years
+   R, annual rate of interest
+   
+Output :
+   simple interest = P × T × R
 ```
 
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