Assuming you meant battery percentage, this is what you need to do for the iPhone 5S and 5C: go to Settings, then General, then Usage. You'll then see an option to "switch on battery percentage."
sidekick and iphone sidekick and iphone
Yes, you can put an iPhone camera in an iPhone 3GS provided you have the required skills.
I dont know who is the batter.... but maybe if your grammer was better, i would know
2.5%
56%
.125
14.55
4 percent
56%
66.667%.
83.73 percent
It is: 0.14*100 = 14%