Refactor — Bind a Repeated Subexpression with LET

A revenue-ops analyst's tiered-discount formula computes the same subexpression — average order value (AOV = Revenue / Orders) — three times in one nested IF:

=IF(B2/C2 > 1000, B2*0.15, IF(B2/C2 > 500, B2*0.10, IF(B2/C2 > 100, B2*0.05, 0)))

That's three divisions per cell across thousands of rows in production. More importantly, when AOV's definition changes (e.g., to gross revenue instead of net), all three references need to be updated in lockstep. LET binds the expression to a name once.

Discount tiers (applied to Revenue, not AOV):

Your task:

1. In column D (Discount), write a LET-based formula that returns the discount amount (Revenue × rate) for each customer.
2. The formula must drag-fill from D2 → D11. The grader checks the dollar amount, so any equivalent formula passes — but the style point is to use LET.

Graded cells: D2 (Acme — high AOV → 15%), D3 (Globex — low AOV → 5%), D5 (Hooli — tiny AOV → 0%).