Thanks for that. There would have been costs incurred to develop the bomb, an example of which you have noted. However the question had to due with the production cost each bomb.
GTX
thanks for that. Very interesting. The document confirms that " the existing data makes it hard to identify accurately the precise cost of particular bombs during the war" but uses the figure noted in your post sourced from a report by Harris. The figure seems low to me but is nonetheless the only one that seems to be available. Thanks again.