Baiji north Refinery use kirkuk crude oil(API=36) with total flowrate 150000 BBL/ Day(the price of one BBl of crude oil=87000 Iraqi Dinar).It has the following products: Gasoline 20%(one litre price=450 Iraqi Dinar),Kerosine 15% (one litre price=150 Iraqi Dinar),Gas oil 20%(one litre price=400 Iraqi Dinar),and 45% remaining is Black oil(one litre price=50 Iraqi Dinar). Is this Refinery Win or Lose?

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Differential Equations

Have you ever observed the movement of the satellites and rockets or how the planets go around the sun in their orbits? How will you determine their motion? Definitely they follow some scientific laws and these kinds of problems are framed as differential equations.