The rubber company use Matching Order, which is that we start by considering the price and quantity of materials that we can buy each day, after which this price will be added to the cost and margin. so gross magin is stable

So key driver of profit of the firm is production capacity

Could you answer Is it ok to predict sales growth by using increase percentage of production capacity ?

For example, The firm has production capacity 290,000 on 2019 and has production capacity 400,000 on 2020

make it as percent (400,000 - 290,000)/290,000 *100 = 38%

Can I use this number to a sales growth