C72 Did you fly tonight(4)

"As the market price of sodium benzoate is lower than potassium sorbate, we choose sodium benzoate to reduce the cost. You have asked Henan Xingyuan Chemical Products Co., Ltd., for an offer of 34 thousand yuan per ton of potassium sorbate and 11 thousand yuan per ton of sodium benzoate. Also, our company is used to using sodium benzoate as an additive. If we want to change the formula