Final answer:
Billing schemes result in the highest loss per case compared to other options.Expense tampering, payroll schemes, and register disbursements schemes can also cause financial losses, but they are generally associated with lower losses per case compared to billing schemes.
Step-by-step explanation:
The result that leads to the highest loss per case among the given options is billing schemes. Billing schemes involve manipulating invoices, creating fictitious expenses, or fabricating fraudulent billing documents to misappropriate funds.
For example, an employee could create false invoices from a non-existent company and submit them for payment. This scheme can result in large financial losses for the company, as funds are being paid for fictitious goods or services.
Expense tampering, payroll schemes, and register disbursements schemes can also cause financial losses, but they are generally associated with lower losses per case compared to billing schemes.