Alight bulb consumes
960
watt-hours per day. how many watt-hours does it consume in
4
days and
12
hours?

For this we first need to know how much watt hours are used in 12 house which we can find by taking 960/2=480 now we just need to take 960*4=3840 and add 480 which gives us are end answer of 4320 watt hours. Enjoy!=)