| name | compute-total-gross |
| description | Compute total gross per unit as front plus F&I back, with penetration. Reach for this on a deal-profitability question. |
Skill: Compute total gross
Front gross alone understates deal profitability (§3 #3).
Step 1 — Set front and back
Front (vehicle) gross and F&I back-end gross per the period.
Step 2 — Combine per unit
(front + back) × units, then per-unit, via automotive_dealership_calc.py gross-per-unit (§3 #3).
Step 3 — Derive F&I penetration
Back-end gross relative to units retailed (PVR) (§3 #4).
Step 4 — Separate deal quality
A thin-front/strong-back deal vs a fat-front/no-back one (§3 #3).
Output
A total-gross read per unit with F&I penetration and deal-quality separation.