This is a very indecisive Question.
792
850 - 40 = 810
The cheap $5 to $10 ones usually last about 40 to 60 hours on average. $40 Phillips last about 500 to 700 hours
3240 and 6480
The greatest common factor of 100 , 810 = 10
It is 263.25 : 810 = 13 : 40 or 0.325
5 hours
About 25-30 hours. If you turn vibration off, it could last somewhere near 40 hours.
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Many of Edison's first bulbs lasted less than 40 hours.
80% of 40 hours= 80% x 40 hours= 0.80 x 40 hours= 32 hours
27.50 hours, as a percentage of 40 hours = 100*27.50/40 = 68.75%