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Applied course test series : DMA tranfer

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A computer uses DMA to read from its disk.Suppose that disk has 32 500-byte sectors per track.The disk rotation time is 32 ms.The bus is 32 bits wide, and bus transfer takes 500ns each.The average CPU instruction requires two bus cycles. How much is the CPU slowed down by DMA?

Can some one give answer and solution?
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God help us if such questions show up in the exam. The time taken to understand the language in the question, figure out all the assumptions, calculate etc will be far greater than 3 mins.
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@tp21 Can you please share your solution?

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This is how I tried it.

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Hey @shashin @tp21 this is how I did this. Is this correct?

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Shashin we can also simply do,like,

since 500ns is consumed for every 8μs so the time consumed or Cpu slowed down = 500ns/8μs =0.0625
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