How much did using the atomic bomb on japan cost for the US in World War 2?

Answer 1

It has been argued that the atomic bomb cost aound 2 billion dollars for the 3 bombs: 1 test bomb and the 2 actaully dropped

Almost every penny of that was spent on the industrial infrastructure needed to make the bombs. The cost of the bombs themselves was virtually negligible compared to that. 24 bombs were scheduled for production in 1945: 1 test bomb and 23 to be dropped on Japan. It is unlikely these extra bombs had they been produced would have raised the cost much at all.

The actual cost of a nuclear weapon's physics package is still classified.

Answer 2

Hiroshima was in ruins. The T-bridge's barriers had been knocked awry; utility poles stood at odd angles, and familiar landmarks were gone or unrecognizable. Buildings-even strong modern structures-had suffered significant damage, some pushed off their foundations, some gutted by fire, others utterly destroyed. Many steel and concrete buildings appeared intact at first glance, but their outer walls hid internal damage due to the downward pressure of the air burst. Cemeteries were uprooted, and churches had become rubble.

Rebuilding efforts over the decades have been fruitful. There has so much rebuilding and new buildings that the count was lost. Nowhere you fill that information.

Answer 3

Japan had no means to rebuild those cities and the United States spent 15 years to rebuild the place.