what is the average discount offered for different types of credit cards?

shipper_id: Unique Io of the Shipper shipper name: Name of the Shipper shipper_contact_details: Contact detail of the Shipper product_id: Unique ID of the Product vehicle_maker: Vehicle Manufacturing company name vehicle_model: Vehicle nodel name vehicle_color: Color of the vehicle vehicle model year: Year of Manufacturing vehicle pricet Price of the Vehicle quantity: Ordered Quantity customer_id: Unique ID of the customer customer_nane: Name of the customer gender: Gender of the customer job_title: Job Title of the customer. phone_number: Contact detail of the customer emai1_addres5: Email address of the customer city: Residing city of the customer country: Residing country of the customer state: Residing state of the customer customer_address: Address of the customer order_date: Date on which customer ordered the vehicle order_id: Unique ID of the order ship_date: Shipment Date. ship mode: Shipping Mode/Class: shipping: Shipping ways: postal_code: Postal code of the customer discount: Discount given to the customer for the particular order by credit card in percentage credit_card_type: Credit Card Type credit_card_number: Credit card number. custoner_feedback: Feedback of the customer quarter_number: Quarter Number