calculate the cost of nuclear fuel fabricated and delivered on-site using the following data: cost of natural uranium, $60 lb; u3o8 enrichment, 4.2%; conversion, $11.50 kgu; tails, 0.25%; price of swu, $110; conversion loss, 0.6%; fabrication0transportation cost, $230 kgu; fabrication loss, 0.7%. 4. if the enrichment changes by 0.4%, that is, goes from 4.2% to 4.6%, by what percentage does the cost of fuel in problem 4.3 change?