A program P reads and processes 1000 consecutive records from a sequential file F stored on device D without using any file system facilities. Given the following

   Size of each record = 3200 bytes
   Access time of D = 10 msecs
   Data transfer rate of D = 800 × 103 bytes/second
   CPU time to process each record = 3 msecs 

What is the elapsed time of P if
(a) F contains unblocked records and P does not use buffering?
(b) F contains unblocked records and P uses one buffer (i.e., it always reads ahead into the buffer)?
(c) records of F are organized using a blocking factor of 2 (i.e., each block on D contains two records of F) and P uses one buffer?

You may assume that the CPU time needed to transfer a record from a buffer to a local variable of P is negligible.