How many double crossovers would be recovered

In Drosophila, the genes b,c, and sp are linked and in order given, the distancs being b-c=40cM and c-sp= 40cM. These intervals exhibit 75% interference (I=0.75). How many double crossovers would be recovered in a 3-point cross involvng b,c, and sp out of 10,000 progeny?

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