Answer:
The answer is: 50 basic units and 13 deluxe units
Explanation:
                   Basic model       Deluxe model        Total
Sales price            $45              $49
Variable costs          $35              $40
Contribution margin     $10               $9
× Sales Mix             4                 1                 5
Total contribution m. Â Â Â $40 Â Â Â Â Â Â Â Â Â Â Â Â Â $9 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â $49
Weighted contribution margin = total contribution margin / units = $49 / 5
Weighted contribution margin = $9.8
Break even point  = total fixed costs / weighted contribution margin
Break even point = $617 / $9.8 = 62.96 units ≈ 63 units