Regarding GST on Orix Lease Car

If in case, a car dealer is A and a
company is B, B company's employee is C. my question is Kia car is been purchased from A, Now A has raised a invoice in the name of C GST is 28% cess 22% intotal 50%. ORIX is collecting GST from B. query is now X showroom price GST Road tax mentioned in the Invoices recoverable and Interest Income. now can we collect only 18% of the GST on Interest amount please clarify this.
1:-In the hands of employee which could be better option owing or leasing the car???