add 2278

Author: fishercoder1534

README.md

@@ -9,6 +9,7 @@ _If you like this project, please leave me a star._ ★
 | #    |      Title     | Solutions                                                                                                                                | Video                                                                         | Difficulty  | Tag                  
 |------|----------------|------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------|-------------|-------------
 | 2279 |[Maximum Bags With Full Capacity of Rocks](https://leetcode.com/problems/maximum-bags-with-full-capacity-of-rocks/)| [Java](../master/src/main/java/com/fishercoder/solutions/_2279.java)                                                                     || Medium                                                                        ||
+| 2278 |[Percentage of Letter in String](https://leetcode.com/problems/percentage-of-letter-in-string/)| [Java](../master/src/main/java/com/fishercoder/solutions/_2278.java)                                                                     || Easy                                                                          ||
 | 2270 |[Number of Ways to Split Array](https://leetcode.com/problems/number-of-ways-to-split-array/)| [Java](../master/src/main/java/com/fishercoder/solutions/_2270.java)                                                                     || Medium                                                                        ||
 | 2269 |[Find the K-Beauty of a Number](https://leetcode.com/problems/find-the-k-beauty-of-a-number/)| [Java](../master/src/main/java/com/fishercoder/solutions/_2269.java)                                                                     || Easy                                                                          ||
 | 2264 |[Largest 3-Same-Digit Number in String](https://leetcode.com/problems/largest-3-same-digit-number-in-string/)| [Java](../master/src/main/java/com/fishercoder/solutions/_2264.java)                                                                     || Easy                                                                          ||

src/main/java/com/fishercoder/solutions/_2278.java

@@ -0,0 +1,15 @@
+package com.fishercoder.solutions;
+
+public class _2278 {
+    public static class Solution1 {
+        public int percentageLetter(String s, char letter) {
+            int count = 0;
+            for (char c : s.toCharArray()) {
+                if (c == letter) {
+                    count++;
+                }
+            }
+            return (int) Math.floor((count * 100.0 / s.length()));
+        }
+    }
+}