Please help I have no idea how to get the correct answer of A: $6273 U

Hang 10 Inc. produces two types of surfboards: basic and deluxe. The basic surfboard sells for $25 and the deluxe sells for $100. Hang 10 is budgeting sales for 2016 of 1,000 basic surfboards and 650 deluxe. Variable costs associated with the basic surfboard amount to $10 and $40 for the deluxe. Actual units sold were 1,200 basic and 550 deluxe. What is the sales mix variance? $6273U $6273F $10,455U $10,455F