0
30 minutes = 30 x 60 seconds = 1800 seconds
to calculate the decrease from 1800 to 3 seconds we calculate the difference and then divide through by the start number
so the difference is 1800- 3= 1797
and the original start number was 1800
so the decreae in percentage is 1797/1800 x 100% = 99.83 % decrease
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