Let's break down how much each person paid towards the $10 rental.
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Mark paid: $3
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John paid: \( \frac{2}{5} \) of the total cost. \[ \text{John's payment} = \frac{2}{5} \times 10 = 4 \]
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Total cost: $10 So, the friend's payment can be calculated by subtracting the amounts Mark and John paid from the total cost. \[ \text{Friend's payment} = 10 - (3 + 4) = 10 - 7 = 3 \]
Now, let's summarize what each person paid:
- Mark: $3
- John: $4
- Friend: $3
From this breakdown, we can see that John paid the most towards the rental, which amounts to $4.
Thus, the answer is: John.