Originally Posted by

**fredrick08** A fruit drink is made from 3 ingredients.

let j be the fraction of the drink that is juice

s be the fraction of the drink that is sugar and flavouring

w be the fraction of the drink that is water.

the cost of the drink per liter is $12j+3s+w, and it can sold at $2+s+j/litre. choose j and s to maximize the profit, for marketing reasons j>=1/20

1. express profit per litre as a function of j and s.

How do express profit, say i let z=profit in dollars per litre. z= price sold-cost=2-11j-2s????

2. Express problem to maximize profit, subject to constraints.

well my constraints are j>=1/20, s,j,w>=0... what are my others?