Step-by-step explanation:
10.00 - 4.84 = 5.16
(Find how much Tim paid)
Since the torch costs 11 times as much, it is 11 units, and the battery costs 1 unit. So, 12 units is $5.16.
Find 1 unit which is the battery:
12 units = $5.16
1 unit = $0.43
Answer: $0.43
