Fix typo in README.md

Author: jha-smriti

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
+   simple interest = p * t * r
 ```
 
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