Recyclers buys used motor oil for $0.50 per liter from shops that specialize in oil changes and other minor services for cars. The cost of transporting and refining the motor oil is $1.25 per liter. The refined oil becomes commercial-grade motor oil and a thick residual fuel oil. Each liter of used motor oil yields 0.9 L of commercial-grade motor oil and 0.1 L of residual fuel oil. Commercial-grade motor oil is sold for $3.30 per liter, and residual fuel oil is sold for $1.50 per liter. With additional processing, residual fuel oil can be converted into special fuel oil. The additional processing costs $0.35/L. What would be the minimum acceptable price for the special fuel oil? (Round to 2 decimal places, e.g., 15.25.) Price $