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Formula for Counting Downtime Percentage (%)

Theva asked
Last Modified: 2012-06-21

I would like request Experts help to build formula to count accumulation total downtime percentage in Row-E,sheet 2(Channel Downtime).

e.g, in cell-E2 the downtime percentage is 99.89%. By right in cell-E3, it should maintain with 99.89% because no downtime was captured in week-2, same situation in week-3, the percentage in cell-E4 should remain unchanged because  of no downtime captured in week-3, but in week-4 the percentage should minus with downtime (D5) and this counting will continue until week-53.  

Hope Experts can help me to create this formula in row-E,sheet-2. I've attached the xls for your perusal.  
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