Explanation:
To calculate the cost for a house with 22 windows, where the rate is $20 per \: house \: plus \: an \:additional\: $1 per window, We can use the formula:
➥ Cost = Rate (per house) + Rate (per window) * Number of Windows
Let's plug in the values:
So, it will cost $42 to have a house with 22 windows cleaned.
