Final answer:
The question involves a complex financial decision related to lease-versus-buy analysis for Sadik Industries. Without the provided Excel file or any additional data, the net advantage of leasing cannot be calculated or concluded upon.
Step-by-step explanation:
The student's question pertains to the finance area of business studies and involves making a lease-versus-buy decision for Sadik Industries. To calculate the net advantage of leasing (NAL), we would compare the cost of leasing the equipment with the cost of buying it, taking into account all relevant factors such as maintenance expenses, tax rate, depreciation under MACRS, loan interest, and lease terms. Typically, this would involve a detailed analysis, including calculating present values of cash outflows under both options and considering tax implications. However, without the provided spreadsheet or additional data and a request not to make stuff up, we cannot compute the NAL.