Exercise 1: Why E2 Doesn't Benefit From Sustained Use Discounts — Possible Solution
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Sustained Use Discounts apply automatically to a real, specific set of
eligible machine families - N1 and M1/M2 can reach up to a 30%
discount, while N2/N2D and C2 can reach up to 20%. E2 is explicitly
NOT on this real list of eligible families at all.

The team's expectation is based on a reasonable-sounding but
incorrect assumption: that running ANY instance continuously for a
full month automatically earns a growing real discount. In reality,
eligibility for SUDs depends on which specific machine family is
being used, not simply on how long the instance runs. E2's own real
positioning is as an already cost-effective family with lower baseline
pricing - it was designed to compete on price directly, rather than
through a stacking sustained-use discount mechanism.

ANSWER: This expectation is incorrect because E2 machines are
specifically excluded from Sustained Use Discount eligibility,
regardless of how continuously they run - running an E2 instance for
the full month earns no additional SUD at all, unlike an N2 or N1
instance in the same situation. The team's real total cost would still
be calculated purely off E2's own already-lower baseline rate, not a
rate reduced further by SUDs.

WHY THIS WORKS AS AN ANSWER
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This correctly identifies that SUD eligibility is a real, specific
per-family property, not a universal reward for any long-running
instance, and directly names E2 as the concrete real exception the
chapter's own warn-box specifically flags.