Hello lightninghelix

Suppose they make $\displaystyle x$ deluxe notebooks and $\displaystyle y$ regular notebooks. Quote:

a deluxe notebook with subject dividers, which sells for $4.00, and a regular notebook, which sells for $3.00.

The total selling price is $$\displaystyle (4x+3y)$. Quote:

The production cost is $3.20 for each deluxe notebook, and $2.60 for each regular notebook

So the total production cost is $$\displaystyle (3.2x+2.6y)$

Quote:

between 2000 and 3000 deluxe notebooks

$\displaystyle 2000 \le x \le 3000$

Quote:

between 3000 and 6000 regular notebooks

$\displaystyle 3000\le y \le 6000$ Quote:

not more than 7000 altogether

$\displaystyle x+y\le 7000$

Can you continue from here?

Grandad