What is the ruling on investing with a company that imports and sells used cars through a lease-to-own system, whereby the investor pays a sum to the company in exchange for a fixed percentage of the expected profits (21%), while the company's share is affected by the actual increase or decrease in profits?

It is permissible to partner financially with someone who leases cars with a lease-to-own agreement, under three conditions: First, the leasing system must be legitimate, involving a valid lease contract and a promise of sale or gift, with the lessor being responsible for the car's warranty and maintenance. Second, there should be no guarantee of the capital, meaning the company is not obligated to return it in case of loss, unless due to its own negligence. Third, the profit must be determined as a common percentage of the actual profit, not a fixed sum or a percentage of the capital; otherwise, the partnership becomes void. Accordingly, it is not permissible to invest in this company if the profit is a fixed percentage unrelated to the actual profit.