Originally Posted by

**andyboy179** 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 20% per hour is not 40% in 2 hours

250 - 100= 150

150 units remaining

PART B

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.

do i do another 2 hours from the 150 units left? or is it 4 hours from a new battery, 250untis?