diff --git a/src/InsuranceCalculator.java b/src/InsuranceCalculator.java
deleted file mode 100644
index 558e0a0..0000000
--- a/src/InsuranceCalculator.java
+++ /dev/null
@@ -1,15 +0,0 @@
-public class InsuranceCalculator {
-
-    public double calculateInsurance(double income) {
-        if (income <= 10000) {
-            return income*0.365;
-        } else if (income <= 30000) {
-            return (income-10000)*0.2+35600;
-        } else if (income <= 60000) {
-            return (income-30000)*0.1+76500;
-        } else {
-            return (income-60000)*0.02+105600;
-        }
-    }
-
-}
diff --git a/src/ifs/InsuranceCalculator.java b/src/ifs/InsuranceCalculator.java
new file mode 100644
index 0000000..5e8f1df
--- /dev/null
+++ b/src/ifs/InsuranceCalculator.java
@@ -0,0 +1,23 @@
+package ifs;
+public class InsuranceCalculator {
+
+    private InsuranceStrategyVeryHigh strategy;
+
+    public double calculateInsurance(double income) {
+
+        if (income <= 10000) {
+            strategy = new InsuranceStrategyVeryHigh();
+            return strategy.calculate(income);
+        } else if (income <= 30000) {
+            strategy = new InsuranceStrategyVeryHigh();
+            return strategy.calculate(income);
+        } else if (income <= 60000) {
+            strategy = new InsuranceStrategyVeryHigh();
+            return strategy.calculate(income);
+        } else {
+            strategy = new InsuranceStrategyVeryHigh();
+            return strategy.calculate(income);
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/src/ifs/InsuranceStrategy.java b/src/ifs/InsuranceStrategy.java
new file mode 100644
index 0000000..875eaf1
--- /dev/null
+++ b/src/ifs/InsuranceStrategy.java
@@ -0,0 +1,10 @@
+package ifs;
+
+public abstract class InsuranceStrategy {
+    public double calculate(double income) {
+        return (income - getAdjustment()) * getWeight() + getConstant();
+    }
+    public abstract int getConstant();
+    public abstract double getWeight();
+    public abstract int getAdjustment();
+}
diff --git a/src/ifs/InsuranceStrategyHigh.java b/src/ifs/InsuranceStrategyHigh.java
new file mode 100644
index 0000000..7d4efaf
--- /dev/null
+++ b/src/ifs/InsuranceStrategyHigh.java
@@ -0,0 +1,16 @@
+package ifs;
+
+public class InsuranceStrategyHigh extends InsuranceStrategy {
+    @Override
+    public int getConstant() {return 76500;}
+
+    @Override
+    public double getWeight() {
+        return 0.1;
+    }
+
+    @Override
+    public int getAdjustment() {
+        return 30000;
+    }
+}
diff --git a/src/ifs/InsuranceStrategyLow.java b/src/ifs/InsuranceStrategyLow.java
new file mode 100644
index 0000000..d563940
--- /dev/null
+++ b/src/ifs/InsuranceStrategyLow.java
@@ -0,0 +1,16 @@
+package ifs;
+
+public class InsuranceStrategyLow extends InsuranceStrategy {
+    @Override
+    public int getConstant() {return 0;}
+
+    @Override
+    public double getWeight() {
+        return 0.365;
+    }
+
+    @Override
+    public int getAdjustment() {
+        return 0;
+    }
+}
diff --git a/src/ifs/InsuranceStrategyMedium.java b/src/ifs/InsuranceStrategyMedium.java
new file mode 100644
index 0000000..3c71f32
--- /dev/null
+++ b/src/ifs/InsuranceStrategyMedium.java
@@ -0,0 +1,16 @@
+package ifs;
+
+public class InsuranceStrategyMedium extends InsuranceStrategy {
+    @Override
+    public int getConstant() {return 35600;}
+
+    @Override
+    public double getWeight() {
+        return 0.2;
+    }
+
+    @Override
+    public int getAdjustment() {
+        return 10000;
+    }
+}
diff --git a/src/ifs/InsuranceStrategyVeryHigh.java b/src/ifs/InsuranceStrategyVeryHigh.java
new file mode 100644
index 0000000..b3389ea
--- /dev/null
+++ b/src/ifs/InsuranceStrategyVeryHigh.java
@@ -0,0 +1,12 @@
+package ifs;
+
+public class InsuranceStrategyVeryHigh extends InsuranceStrategy {
+    @Override
+    public int getConstant() {return 105600;}
+
+    @Override
+    public double getWeight() {return 0.02;}
+
+    @Override
+    public int getAdjustment() {return 60000;}
+}
\ No newline at end of file
diff --git a/test/ifs/InsuranceCalculatorTest.java b/test/ifs/InsuranceCalculatorTest.java
new file mode 100644
index 0000000..090ee3e
--- /dev/null
+++ b/test/ifs/InsuranceCalculatorTest.java
@@ -0,0 +1,29 @@
+package ifs;
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+
+class InsuranceCalculatorTest {
+    @Test
+    public void low() {
+        assertEquals(1825, insuranceFor(5000), 0.01);
+    }
+
+    @Test
+    public void medium() {
+        assertEquals(38600, insuranceFor(25000), 0.01);
+    }
+
+    @Test
+    public void high() {
+        assertEquals(78500, insuranceFor(50000), 0.01);
+    }
+
+    @Test
+    public void veryHigh() {
+        assertEquals(106400, insuranceFor(100_000), 0.01);
+    }
+
+    private double insuranceFor(double income) {
+        return new InsuranceCalculator().calculateInsurance(income);
+    }
+}
\ No newline at end of file