gas bill help- numbers transposed?

mrs_baggins

Please can someone help with an Npower bill I have dated last april? I have only just been working out how the KW is arrived at and after working out how I think it should be worked out I think maybe some figures have been transposed to make the bill higher but before i contact them thought I would run it past you guys to check!

previous reading 268
new reading 550

making 282 cu feet. which is what it says on bill.

now according to back of bill to get KWh do the following

282X 2.83= 798.06 to get cubic metres

then apply the equation

798.06 x calorif value which at time was 39.3339 then divide by 3.6 , so sum would be

798.06 x 39.3339 ~ 3.6 = 8719.67 kWh ? is this right?

because on the bill it says 8917 Kwh making it 198 more than it actually was? or am i making a mistake somewhere?

thanks

mrs_baggins

sorry! please ignore me. I forgot to add the correctio factor