maths gone blank

[skystorm]

HI all back on nite shift
A 2.5 kw heater is in use for 7.5 hours daily and energy cost 7.1p per unit. the total cost of running the heater over a month of 28 days is = How to work it out

 

[Knobhead]

£37-28p

 

[skystorm]

how did u get it tony

 

[alli]

2.5Kw X 7.5hours = 18.75 Kw in a day X 28 days = 525Kw in a month X £0.071 = £37.275

 

[Octopus]

HI all back on nite shift
A 2.5 kw heater is in use for 7.5 hours daily and energy cost 7.1p per unit. the total cost of running the heater over a month of 28 days is = How to work it out

2.5Kw x 7.5 hours x £0.071 x 28 days

 

[skystorm]

thanks all i was doing it this way 2.5 x7.5.x 60 x 28 I dont know why i was doing it that way but thanks all

 

[Octopus]

thanks all i was doing it this way 2.5 x7.5.x 60 x 28 I dont know why i was doing it that way but thanks all

Where does the 60 come from?

 

[ackbarthestar]

HI all back on nite shift
A 2.5 kw heater is in use for 7.5 hours daily and energy cost 7.1p per unit. the total cost of running the heater over a month of 28 days is = How to work it out

1 unit = 1KWHr

So

Power consumption * Hrs/day *no. of days * price /unit = total cost

 

[Silly Sausage]

thanks all i was doing it this way 2.5 x7.5.x 60 x 28 I dont know why i was doing it that way but thanks all

Stick another 60 in there for Joules :smiley2: