[Add] solved solutions

cpp/FLOW009.cpp

@@ -0,0 +1,22 @@
+#include <iostream>
+#include <iomanip>
+
+using namespace std;
+
+int main()
+{
+    int t, i;
+    double q, p, sum;
+    cin >> t;
+    for (i = 0; i < t; i++)
+    {
+        cin >> q >> p;
+        sum = q*p;
+        if (q > 1000)
+        {
+            sum = sum*9/10;
+        }
+        cout << fixed << sum << endl;
+    }
+    return 0;
+}