diff --git a/AcWing/672/672.cpp b/AcWing/672/672.cpp
new file mode 100644
index 00000000..e1e42259
--- /dev/null
+++ b/AcWing/672/672.cpp
@@ -0,0 +1,18 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    double x;
+    cin >> x;
+    if (0.00 <= x && x <= 2000.00) {
+        cout << "Isento" << endl;
+    } else if (2000.01 <= x && x <= 3000.00) {
+        cout << "R$ " << fixed << setprecision(2) << (x - 2000.00) * 0.08 << endl;
+    } else if (3000.01 <= x && x <= 4500.00) {
+        cout << "R$ " << fixed << setprecision(2) << (1000.00 * 0.08) + (x - 3000.00) * 0.18 << endl;
+    } else {
+        cout << "R$ " << fixed << setprecision(2) << (1000.00 * 0.08) + (1500 * 0.18) + (x - 4500) * 0.28 << endl;
+    }
+    return 0;
+}