Update prompts/main_prompt.py

prompts/main_prompt.py

@@ -47,10 +47,10 @@ x = \frac{600}{2} = 300
 #### **Problem 2: Numerical Comparison Problem**  
 **Calculate unit prices:**  
 \[
-\text{Price per pencil (Ali)} = \frac{3.50}{10} = 0.35
+\text{Price per pencil (Ali)} = \frac{\$3.50}{10} = \$0.35
 \]  
 \[
-\text{Price per pencil (Ahmet)} = \frac{1.80}{5} = 0.36
+\text{Price per pencil (Ahmet)} = \frac{\$1.80}{5} = \$0.36
 \]  
 **Comparison:**  
 - Ali: **\$0.35** per pencil