In the above, the reading is taken from the figures shown under the words CUBIC FEET. The meter reads 81,710, which is the total number of cubic feet of water recorded since the meter was installed. Because our charge is based on units of 100 cubic feet, the meter reader discards the last two numbers (the ones with the black background). So, this reading would actually be 817.
So, when we read your bills the next time you have used 1,200 cubic feet of water, the new reading would be 82,910 (81,710 plus 1,200). Again, we'd drop the last two numbers, and your official reading would be 829. Your bill would be figured by subtracting the old number (817) from the new number (829). You would then be billed for 12 units