Answer:
The overall break-even point will be increased
Explanation:
Contribution margin ratio
( Sales - variable cost ) / Sales
U82U = ( $28,000 - $13,440 ) / $28,000 = $14,560 / $28,000 = 0.52
P89W = ( $18,000 - $7,260 ) / $18,000 = $10,740 / $18,000 = 0.60
As the contribution margin ratio of U82U is lower than the P89W, so, the shift of sales towards U82U will increase the overall break-even point because more unit with lower contribution will be needed to sale to recover the fixed cost.