hello everyone...

I have a quation here says

**Bulldust Inc. blends silicon and nitrogen to produce two types of fertiliser. Fertiliser 1**

**must be at least 40% nitrogen and sells for $20/kg. Fertiliser 2 must be at least 70%**

**silicon and sells for $18/kg. Bulldust can purchase up to 800 kg of nitrogen at $10/kg and**

**up to 1000 kg of silicon at $8/kg. Assuming that all fertiliser produced can be sold,**

**formulate an LP to help Bulldust maximize profit.**

Ive tried so many different ways but still cant get the right answer.. could please someone help me answering this question

thanks.