Answer:
The current BEP is 727 units
with the proposed change it will be 875 units
The change increase the break even point by 148 units
Step-by-step explanation:
The BEP in units will be:

Where:
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40 - 18 = 22 contribution margin
then we calcualte BEP
16,000 / 22 = 727,27 units
with the proposed change:
40 - 16 = 24 contribution margin
16,000 + 5,000 = 21,000 fixed cost
21,000 / 24 = 875
875 - 727 = 148