Hi, this question has two parts so i will tell you part 1 first:
A toy rabbit works using a single battery. When the battery is new, it has 250 units of power. After every hour of use the battery loses 20% of its remaining power.
How many units of power remain in the battery after 2 hours?
10% of 250= 25
25 x 4= 100
250 - 100= 150
150 units remaining
The battery must have at least 100 units of power left for the toy rabbit to work.
Show that the toy rabbit will still be working after 4 hours.
i don't understand because, 100untis if from 2 hours so 100 x 2=200 = 4 hours
250-200=50 but it needs at least 100units to work