This question evaluates proficiency in break-even analysis, algebraic modeling of promotional spend uplift, and unit-economics calculation for customer acquisition within a data science context.

A credit-card promo offers a 30% discount on RH-category purchases ("RH" = the merchant category eligible for the promo). During the promo period:
Let x be the number of new customers acquired due to the promo.
(a) Solve the break-even equation:
550·x − 0.30·(1,000·x + 2,000,000·5%·600) = 0
(b) Compare this x to the previous break-even (where existing/new RH spend was $500) and explain intuitively why the required new-customer count changes despite higher spend.
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