Fix typo in README

DaffaPermadi · DaffaPermadi · commit 3794cd60fd2f · 2024-11-23T17:43:16.000+07:00
diff --git a/README.md b/README.md
@@ -6,11 +6,11 @@ A calculator that calculates simple interest given principal, annual rate of int
 
 ```
 Input:
-   p, principal amount
-   t, time period in years
-   r, annual rate of interest
+   P, principal amount
+   T, time period in years
+   R, annual rate of interest
 Output
-   simple interest = p*t*r
+   simple interest = P*T*R
 ```
 
 _© 2022 XYZ, Inc._
