Hello
I have made up a Spread sheet for recording a machines operating hours. Everything I have tried to my knowledge is giving me the wrong totals. Its probably basic to some of you but I am stumped? Maybe something I haven't learnt as yet!
Here is my problem? if a machine has 200 hrs on hour meter. The next time it is recorded which I would like to do is weekly is 10 hrs running time. that makes it 210 The following week is 220 hrs. The total is 30 hrs running time. I seem to get all figures doubled or somehow its less. Any help would be greatly appreciated.

Geoff H