How much is a ton of steel structure installation in Changchun? How much is a flat, excluding crane color steel plate, and how to pay by payment method?

The light steel we have made in the past two years is 400 yuan's heavy steel, and each ton is 300 yuan's, excluding the crane fee. No matter how long it takes to clean the gusset plate, it is actually calculated based on the square empty wall on one side of 3 yuan, excluding the crane fee. The project payment is calculated according to the engineering quantity, 70% of the final completion, and 95% of the remaining 5% will be calculated after two years without engineering quality problems! Construction experience of our company. You should check it before you sign it.