Insufficient data for precise unit change Steps:

• Original break-even point (BEP) in units = fixed costs / contribution per unit = $2100 / C, where C is unknown contribution per unit (selling price minus$100 variable cost).
• New contribution per unit = 1.05C; new fixed costs = 1.10 × $2100 =$2310.
• New BEP = $2310 / 1.05C =$2200 / C.
• Change in BEP = ($2200 / C) - ($2100 / C) = 100 / C units (increase); C unknown, so exact units cannot be determined.

Not enough information.

Final answer: Not enough information.