Final answer:
The cost price of the bike is $700.
Step-by-step explanation:
To find the cost price of the bike, we can use the formula:
Cost price = Selling price - Profit
Given that the profit is 5% of the cost price and Gai gained $35, we can calculate the cost price:
Cost price = $35 / 0.05 = $700
Therefore, the cost price of the bike is $700.