Final answer:
The cost of each pair of trainers to the shop is £40.
Step-by-step explanation:
To find the cost of each pair of trainers to the shop, we can use the formula:
Cost price = Selling price / (1 + Profit percentage)
Given that the selling price is £68 and the profit percentage is 70%, we can substitute these values into the formula:
Cost price = £68 / (1 + 0.7) = £40
Therefore, the cost of each pair of trainers to the shop is £40.