Hi,
Suppose that in your custom field, you've configured the column to be "my_field" and that you've added two values 0 and 1 with their titles being respectively "no" and "yes".
You can use this formula:
({my_field}*60+{price})*{cart_product_quantity}
That way, {my_field} will be replaced by either 0 or 1, {price} will be replaced by the base price of the product that you've configured in the product, and {cart_product_quantity} will be replaced by the quantity of the product in the cart (or 1 on the product details page).
So for example, if the base price of the product is 100, if "no" is selected, the price will be: (0*60+100)*1 = 100
And if "yes" is selected, the price will be: (1*60+100)*1 = 160