Pure Storage Online Assesment question

Can anyone tell me the approach to solve this question?
Thank you

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1TB = 1000GB / 2048 = 0.49GB => One object is 0.49GB

10GB / 0.49GB = 20 => You can put 20 objects in fast cache

A :(20/20481+2028/2048200) * 10 = 1980.566

B: 20/20481+2028/2048200= 198.056

C : 1 ms read from fast cache

D : 500 ms read from memory

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