Less than 9x the cost of California HSR or the UK's HS2. With that money, California HSR aims to build 840km and HS2 aims to build 230km. China, with 42000km, built 50x the rail of California HSR and 180x the rail of HS2 and is delivering economic and social mobility benefits today.

Either way, infrastructure doesn't need to be profitable at a first-order level to be profitable to the country as a whole. The increase in economic mobility, social mobility, consumer spending, travel, and logistical efficiencies typically have returns that far exceed that of fares: in typical North American transit systems, although they operate at a loss on paper, it's estimated that each dollar put into transit returns $4-$5 in economic returns.