Hello Unix gurus,
Can anyone tell me the most efficient way to create script for the formula?

Formula:

Ans = 1 - ((Buffer pool data physical reads + Buffer pool xda physical reads + Buffer pool index physical reads + Buffer pool temporary data physical reads + Buffer pool temporary xda physical reads + Buffer pool temporary index physical reads )
/ (Buffer pool data logical reads + Buffer pool xda logical reads + Buffer pool index logical reads + Buffer pool temporary data logical reads + Buffer pool temporary xda logical reads + Buffer pool temporary index logical reads )) * 100%

My input file is....
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$ cat bphit.txt
Buffer pool data logical reads = 19622675514
Buffer pool data physical reads = 2032513088
Buffer pool temporary data logical reads = 2061535206
Buffer pool temporary data physical reads = 2156609
Asynchronous pool data page reads = 1206874663
Buffer pool data writes = 14270567
Asynchronous pool data page writes = 14226588
Buffer pool index logical reads = 11674823029
Buffer pool index physical reads = 137136399
Buffer pool temporary index logical reads = 0
Buffer pool temporary index physical reads = 0
Asynchronous pool index page reads = 24574557
Buffer pool index writes = 5594544
Asynchronous pool index page writes = 5566653
Buffer pool xda logical reads = 6
Buffer pool xda physical reads = 5
Buffer pool temporary xda logical reads = 0
Buffer pool temporary xda physical reads = 0
Buffer pool xda writes = 0
Asynchronous pool xda page reads = 0
Asynchronous pool xda page writes = 0
==================================================

What will be the most efficient way to achieve this?