Tanker Tech-Tethers produces an electronic dog collar. The annual budget for the collar production in the current year was: Budget Actual Production and sales 4000 units 3900 units Variable production costs $640,000 $631,800 Fixed production costs $480,000 $483,000 Prepare an end-of-year budget variance report using: Static budgeting Flexible budgeting Which of the two budgetary approaches is better? Which best reflects the performance of the production manager? Explain your reasoning in DETAIL