Final answer:
After calculating the price per chair for both white and black chairs, the black chairs have a slightly lower unit price at $20.20, compared to the white chairs at $20.22.
Step-by-step explanation:
To find out which color chair has a lower unit price, we need to calculate the price per chair for both the white and black chairs. For the white chairs, we take the total price of $141.54 and divide it by the number of white chairs, which is 7. This calculation gives us:
Price per white chair = $141.54 / 7 = $20.22
Similarly, for the black chairs, we divide the total price of $101 by the number of black chairs, which is 5:
Price per black chair = $101 / 5 = $20.20
Since the unit price for the black chairs is $20.20 and the unit price for the white chairs is $20.22, the black chairs have a slightly lower unit price. Thus, the answer is:
b) Black