1) If 25 tonnes of uranium recovered from reprocessing (U-235 concentration: 0.8%) is supplied in addition to natural uranium, how many tons of natural uranium is needed to obtain 27.7 tonnes of 4% enriched uranium as a product? How many tonnes of depleted uranium would be generated in that case?

2) Based on the results of 1, discuss the introduction of reprocessing from the perspective of effective utilization of uranium resources.