The answer our teacher gave us is " VC- Turbo is more economical with P7,661.79 compared with VGT " but didn't explain how he solved it. Ineed solution with it please!

A gasoline engine is an internal combustion engine that requires fuel for its combustion and operation. Due to the development of its technology new designs are being developed. Among the new design of the engine, is the variable compression turbo or VC-turbo that makes it more fuel-efficient, and moving parts are subjected to less mechanical stress. Another design is the variable geometry turbo or VGT which is focused on energy recovery from the exhaust system of the engine. Comparing to standard engine design: VC- Turbo is 1.10 times the standard engine cost. The maintenance cost is reduced by 0.65 than the usual. The fuel consumption is decreased by 12%. VGT is 1.05 times the standard engine cost. The maintenance cost is reduced by 0.30 than the usual. The fuel consumption is decreased by 5%. The standard engine costs P320,000, the maintenance cost on average is at P15,000 every 3 months. The average fuel consumption is 10 km per liter. Consider the present cost of the engine and maintenance cost within 1 year of engine usage with an interest rate of 9% compounded semi-annually. Then, consider 12,000 km of travel for fuel consumption with gasoline priced at P45 per liter. What design is more economical and by how much compared with the other design