diff --git a/README.md b/README.md
index b103466139..5f5163542e 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ Input:
    t, time period in years
    r, annual rate of interest
 Output
-   simple interest = p*t*r
+   simple interest = p*t*r/100
 ```
 
 _© 2022 XYZ, Inc._
diff --git a/simple-interest.sh b/simple-interest.sh
index 27a60fcb55..24b01761fe 100755
--- a/simple-interest.sh
+++ b/simple-interest.sh
@@ -21,6 +21,6 @@ read r
 echo "Enter time period in years:"
 read t
 
-s=$(expr $p \* $t \* $r / 100)
+s=$(expr ($p * $t * $r) / 100)
 echo "The simple interest is: "
 echo $s