The increase in pens that would be sold to justify this promotion from a contribution perspective is B. 20.08% more pens.
The revised contribution will be:
= 0.2 - 1.196 = 0.996
The amount sold to maintain contribution will be:
= 299000/0.996 = 300201
The increase in volume will be:
= 50201/250000 × 100
= 20.08%
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