diff --git a/09-mostRepeatedChar/index.js b/09-mostRepeatedChar/index.js
index b113ed8..52eb7de 100644
--- a/09-mostRepeatedChar/index.js
+++ b/09-mostRepeatedChar/index.js
@@ -1,4 +1,22 @@
 export function mostUsedChar(text) {
     // implementar logica aqui
-    return ""
+    const boxChar = {};
+    let max = 0;
+    let result = '';
+
+    for(let char of text){
+        if(boxChar[char]){
+            boxChar[char]++;
+        }else{
+            boxChar[char] = 1;
+        }
+    }
+    for(let char in boxChar){
+        if(boxChar[char] > max){
+            max = boxChar[char];
+            result = char;
+        }
+    }
+
+    return result;
 }
\ No newline at end of file