The problem you shared is an optimization problem related to maximizing profits in production, based on resource constraints. Here's a breakdown of the problem:

Variables:

• Let $x$ represent the number of sweet bread ("roti manis") produced.
• Let $y$ represent the number of plain bread ("roti tawar") produced.

Resource Constraints:

1. Flour (terigu):

   • Sweet bread uses 20g per unit.
   • Plain bread uses 40g per unit.
   • The maximum available flour is 8000g (8 kg).
   • Constraint: $20x + 40y \leq 8000$

2. Margarine:

   • Sweet bread uses 20g per unit.
   • Plain bread uses 20g per unit.
   • The maximum available margarine is 6000g (6 kg).
   • Constraint: $20x + 20y \leq 6000$

3. Sugar (gula):

   • Sweet bread uses 20g per unit.
   • Plain bread uses no sugar.
   • The maximum available sugar is 5000g (5 kg).
   • Constraint: $20x \leq 5000$

Objective Function (Profit):

• Sweet bread gives a profit of Rp 1,100 per unit.
• Plain bread gives a profit of Rp 900 per unit.
• The objective is to maximize total profit: $\text{Maximize } Z = 1100x + 900y$

Constraints Summary:

1. $20x + 40y \leq 8000$ (Flour constraint)
2. $20x + 20y \leq 6000$ (Margarine constraint)
3. $20x \leq 5000$ (Sugar constraint)

Additionally, $x \geq 0$ and $y \geq 0$.

Would you like me to proceed with solving this optimization problem to find the values of $x$ and $y$ for the maximum profit?