diff --git a/examples/voucherify_test.py b/examples/voucherify_test.py
index 7b897ba8..6fef7a22 100644
--- a/examples/voucherify_test.py
+++ b/examples/voucherify_test.py
@@ -32,6 +32,24 @@
 Get voucher
 '''
 
+pprint.pprint('=== Get voucher ===')
+voucher = client.get(voucher['code'])
+pprint.pprint(voucher)
+
 '''
-Validate voucher
+Utils
 '''
+
+pprint.pprint('=== Calculate Discount Amount and Price after discount===')
+
+unit_price = 83.45
+items_count = 13
+base_price = unit_price * items_count
+
+discount = voucherify.utils.calculate_discount(base_price, voucher, unit_price)
+new_price = voucherify.utils.calculate_price(base_price, voucher, unit_price)
+pprint.pprint(unit_price)
+pprint.pprint(items_count)
+pprint.pprint(base_price)
+pprint.pprint(new_price)
+pprint.pprint(discount)
diff --git a/voucherify/__init__.py b/voucherify/__init__.py
index 0d509bfd..b4f556f7 100644
--- a/voucherify/__init__.py
+++ b/voucherify/__init__.py
@@ -1,2 +1,2 @@
 from voucherify.client import Client
-from voucherify.utils import calculatePrice, calculatePrice
+import voucherify.utils as utils
diff --git a/voucherify/utils.py b/voucherify/utils.py
index 98fb6f95..552374ea 100644
--- a/voucherify/utils.py
+++ b/voucherify/utils.py
@@ -1,28 +1,73 @@
+import pprint
+
 def round_money(value):
-    """@TODO"""
-    return None
+    if value is None or value < 0:
+        raise Exception('Invalid value, amount should be a number and higher than zero.')
+    return round(value, 2)
 
 
 def validate_percent_discount(discount):
-    """@TODO"""
-    return None
+    if discount is None or discount < 0 or discount > 100:
+        raise Exception('Invalid voucher, percent discount should be between 0-100.')
+
+
+def validate_amount_discount(discount=None):
+    if discount is None or discount < 0:
+        raise Exception('Invalid voucher, amount discount must be higher than zero.')
+
+
+def validate_unit_discount(discount=None):
+    if discount is None or discount < 0:
+        raise Exception('Invalid voucher, unit discount must be higher than zero.')
+
+
+def calculate_price(base_price, voucher, unit_price):
+    e = 100
+
+    if voucher['discount']['type'] == 'PERCENT':
+        discount = voucher['discount']['percent_off']
+        validate_percent_discount(discount)
+        price_discount = base_price * (discount / 100)
+        return round_money(base_price - price_discount)
+
+    elif voucher['discount']['type'] == 'AMOUNT':
+        discount = voucher['discount']['amount_off'] / e
+        validate_amount_discount(discount)
+        new_price = base_price - discount
+        return round_money(new_price if new_price > 0 else 0)
+
+    elif voucher['discount']['type'] == 'UNIT':
+        discount = voucher['discount']['unit_off']
+        validate_unit_discount(discount)
+        new_price = base_price - unit_price * discount
+        return round_money(new_price if new_price > 0 else 0)
+
+    else:
+        raise Exception('Unsupported voucher type.')
 
 
-def validate_amount_discount(discount):
-    """@TODO"""
-    return None
+def calculate_discount(base_price, voucher, unit_price):
+    e = 100
 
+    if voucher['discount']['type'] == 'PERCENT':
+        discount = voucher['discount']['percent_off']
+        validate_percent_discount(discount)
+        return round_money(base_price * (discount / 100))
 
-def validate_unit_discount(discount):
-    """@TODO"""
-    return None
+    elif voucher['discount']['type'] == 'AMOUNT':
+        discount = voucher['discount']['amount_off'] / e
+        validate_amount_discount(discount)
+        new_price = base_price - discount
+        return round_money(discount if new_price > 0 else base_price)
 
+    elif voucher['discount']['type'] == 'UNIT':
+        discount = voucher['discount']['unit_off']
+        validate_unit_discount(discount)
+        price_discount = unit_price * discount
+        return round_money(base_price if price_discount > base_price else price_discount)
 
-def calculatePrice(base_price, voucher, unit_price):
-    """@TODO"""
-    return 0
+    else:
+        raise Exception('Unsupported voucher type.')
 
 
-def calculateDiscount(base_price, voucher, unit_price):
-    """@TODO"""
-    return 0
+__all__ = ['calculate_price', 'calculate_discount']