bug fix typo finished

Signed-off-by: Jasti Sri Radhe Shyam <[email protected]>

Author: jastisriradheshyam

README.md

@@ -9,7 +9,7 @@ Input:
    p, principal amount
    t, time period in years
    r, annual rate of interest
-Output
+Output:
    simple interest = p*t*r
 ```