Final answer:
The painting company would charge $1500 to paint a house requiring 20 hours of labor, calculated by adding the flat rate of $500 to the hourly labor cost of $50 multiplied by 20.
Step-by-step explanation:
To calculate the total charge for painting a house that requires 20 hours of labor by a painting company that charges a flat rate of $500 for supplies, plus $50 for each hour of labor, you can use the formula:
Total Charge = Flat Rate + (Hourly Rate × Number of Hours)
Plugging in the values:
Total Charge = $500 + ($50 × 20)
Total Charge = $500 + $1000
Total Charge = $1500
Therefore, the painting company would charge $1500 to paint a house that requires 20 hours of labor.