If a distributor purchases a hand tool for $60.00/each and sells them to a customer at $95.00/each - What is the gross margin percentage?

If we enter into an aggressive type negotiation on the above hand tool with our customer and are now selling them for $85.00/each - what is our new margin? Our cost remains $60.00/each

What percent increase in quantity of the above hand tool do we need to sell to this customer to maintain the same total gross margin dollars?