Final answer:
To find the cost per battery from a pack that costs £3.99, divide the total cost by the number of batteries (8) resulting in £0.50 per battery after rounding to the nearest penny.
Step-by-step explanation:
To calculate the cost of each battery when a pack of 8 batteries costs £3.99, you divide the total cost by the number of batteries in the pack. Here's the calculation you would follow:
Total cost of the pack: £3.99
Number of batteries in the pack: 8
Cost per battery = Total cost of the pack ÷ Number of batteries in the pack
= £3.99 ÷ 8
= £0.49875
Rounded to the nearest penny, the cost per battery is £0.50.