Stage 2 summary at 50 accepted trajectories

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

tasks_gen/train/G1077/spec.md

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+# 1. Goal
+A water utility bills a household for one quarter. The billing program calls the
+class {{P}}WATER_BILL for each meter reading. The class calculates the amount of
+the bill in euro.
+
+# 2. Open questions
+None.
+
+# 3. Context
+- The class {{P}}WATER_TARIFF exists in package $TMP. It is active. It gives the
+  tariff data of the utility. Read its definition before you start.
+- The tariff data contains a list of price tiers, the standing charge for one
+  day, the sewage percentage, and the minimum charge.
+- All objects are in package $TMP.
+
+# 4. Contract
+- Create the class {{P}}WATER_BILL in package $TMP.
+- The class is public and final. It has a public constructor without parameters.
+- The class has the public type TY_AMOUNT. TY_AMOUNT is a packed number with
+  two decimal places.
+- The class has this public method and no other public method:
+  calculate
+    IMPORTING iv_consumption   TYPE i
+              iv_days          TYPE i
+    RETURNING VALUE(rv_amount) TYPE ty_amount.
+- iv_consumption is the consumption of the household in cubic metres.
+- iv_days is the number of days of the billing period.
+
+# 5. Business rules
+Use the values of the tariff in {{P}}WATER_TARIFF.
+1. Consumption charge:
+   - The tariff gives the price tiers in ascending order.
+   - The tiers are cumulative. The upper limit of a tier is a total consumption,
+     not the width of the tier.
+   - A tier covers the consumption up to its upper limit.
+   - The tier with the upper limit 0 is the last tier. It covers all the
+     consumption above the upper limit of the previous tier.
+   - Multiply the consumption of each tier by the price of that tier.
+   - The consumption charge is the sum of these products.
+2. Sewage charge: it is the sewage percentage of the consumption charge. The
+   sewage percentage is a number of percent (50 means 50 percent). Round the
+   sewage charge to two decimal places.
+3. Standing charge: it is the number of days multiplied by the standing charge
+   of the tariff for one day.
+4. The net amount is the consumption charge plus the sewage charge plus the
+   standing charge.
+5. If the net amount is below the minimum charge of the tariff, the amount of
+   the bill is the minimum charge.
+6. Else the amount of the bill is the net amount.
+7. The amount of the bill has two decimal places.
+
+# 6. Constraints
+- Release target: SAP_BASIS 816 (ABAP Platform 2025).
+- Coding standards: Clean ABAP. Method length below 40 statements. No global
+  variables. No comment that restates the code. Pass large parameters by
+  reference.
+- Out of scope: do not change {{P}}WATER_TARIFF.
+
+# 7. Acceptance
+- The class is active and has no syntax error.
+- The hidden tests pass.
+- Write your own ABAP Unit tests for the class.