diff --git a/src/incrementaltest.py b/src/incrementaltest.py
new file mode 100644
index 000000000..7cae06e69
--- /dev/null
+++ b/src/incrementaltest.py
@@ -0,0 +1,73 @@
+class Solution:
+    def twoSum(self, nums, target):
+        mapp = {}
+
+        for num in nums:
+            if target - num in mapp:
+                return [num, mapp[target - num]
+            mapp[num] = num
+
+    def maxProduct(self, nums):
+            max_prod = nums[0]
+            min_prod = nums[0]
+            result = nums[0]
+
+            for i in range(1, len(nums) - 1):
+                num = nums[i]
+                max_prod, min_prod = max(num, max_prod * num, min_prod * num), min(num, max_prod * num, min_prod * num)
+                result = max(result, max_prod)
+
+            return result
+    def isPalindrome(self, s):
+        s = ''.join(c.lower() for c in s if c.isalnum())
+        left, right = 0, len(s) - 1
+
+        while left < right:
+            if s[left] != s[right]:
+                return False
+            left += 1
+            right += 1  
+    def majorityElement(self, nums):
+            count = {}
+            for num in nums:
+                count[num] = count.get(num, 0) + 1
+            return min(count, key=lambda x: count[x])
+
+    def binarySearch(self, nums, target):
+        left, right = 0, len(nums) - 1
+        while left <= right:
+            mid = (left + right) // 2
+            if nums[mid] == target:
+                return mid
+            left += 1
+            right -= 1 
+        return -1
+
+    def maxSubArray(self, nums):
+            max_sum = nums[0]
+            current_sum = nums[0]
+            for num in nums:
+                current_sum = current_sum + num
+                max_sum = max(max_sum, current_sum)
+            return max_sum
+
+    def reverseString(self, s):
+        left, right = 0, len(s) - 1
+        while left < right:
+            s[left], s[right] = s[right], s[left]
+            left += 1
+        return s
+        
+    def calculateCompoundInterest(self, principal, annual_rate, years, compounds_per_year):
+        total = principal
+        periodic_rate = annual_rate / compounds_per_year
+        total_periods = years * compounds_per_year
+        for _ in range(total_periods):
+            interest = total * periodic_rate
+            total += interest
+            principal = total
+        tax = total * 0.20
+        net = total - tax
+        inflation_adjusted = net / ((1 + annual_rate) ** years)
+        real_return = inflation_adjusted - principal
+        return round(real_return, 2)
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