Hall A is the provisional choice; Hall B could rank higher if its accessibility score is above 7⅓/10, but neither should be booked until accessibility is checked.

Weights: **cost 40%, transit 30%, accessibility 30%**. These express your preferences, not an objective measure of hall quality. Scores below use only the supplied scoring scale.

| Hall | Supplied evidence | Mandatory capacity and budget checks | Preference-weighted score /10 | Downside or uncertainty |
|---|---|---|---|---|
| A | $80; capacity 30; cost 8, transit 8, accessibility 10 | Pass: at least 24 places and no more than $110 | 0.4×8 + 0.3×8 + 0.3×10 = **8.6** | $20 more than C, though C is ineligible; transit below B. Supplied accessibility score still requires a prebooking check. |
| B | $100; capacity 40; cost 6, transit 10; accessibility unknown | Pass | **5.4 + 0.3×accessibility score**; between 5.4 and 8.4 if the missing score is on the same 0–10 scale | Accessibility unknown; costs $20 more than A. |
| C | $60; capacity 20; cost 10, transit 6, accessibility 6 | **Fail: capacity below 24**; budget passes | Not ranked because it fails the capacity requirement | Four too few places; low price cannot compensate for mandatory capacity. |

Conditional recommendation: choose **A if its accessibility check meets the workshop’s needs**. Based on the supplied scores, A’s 8.6 exceeds B’s maximum possible 8.4; the opening threshold claim is therefore incorrect. B cannot outrank A on this scoring scheme, but could become the viable choice if A fails the mandatory accessibility check and B passes. If both fail, neither is suitable.

Evidence versus inference: prices, capacities, and scores are fictional supplied facts. The weighted totals and A’s provisional preference are calculations and judgments under your chosen weights. A 0.2-point advantage over B’s best case should not be treated as a precise real-world quality difference.

Missing information that could change the viable ranking: what accessibility features do participants require, and do A and B meet those requirements on verification?

Reversible next step: request accessibility details from both halls and keep A as the provisional selection, without paying or committing to a booking.