The social rate of time preference is 8 % (annually, in nominal terms). The price index for consumer goods (the CPI) is expected to double every two decades, i.e. the price level will double every 20-year period. The prices of investment goods are expected to increase 2 % annually. The total investment is 600 million $ and the annual return (benefits) from the project is equivalent to 60 million $ (all in nominal terms, current prices) and there will be twenty years with benefits of this size.

Question: For this investment with twenty years of benefits calculate the NPV (state any assumptions needed for the calculation) and will it be accepted from the usual CBA decision criteria?