fix typo on readme file

Author: Romi

README.md

@@ -2,15 +2,15 @@
 
 ## 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 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
+Output:
+   simple interest = p * r * t / 100
 ```
 
-_© 2022 XYZ, Inc._
+_© 2022 XYZ, Inc._