are you sure its 11.50 because what I got is $7.50 To calculate the cost of services for a haircut, we need to multiply the activity rates by the usage of each activity for a haircut and then sum them up. Given: Activity Rate for Hair Washing: $4.00 Activity Rate for Conditioning: $3.50 Activity Rate for Chemical Treatment: $25.00 Activity Rate for Styling: $10.00 For a haircut, the usage of activities is as follows: Hair Washing: 1 Conditioning: 1 Chemical Treatment: 0 Styling: 0 Now, let's calculate the cost of services for a haircut: \text{Cost of services for a haircut} = (1 \times 4.00) + (1 \times 3.50) + (0 \times 25.00) + (0 \times 10.00)Costofservicesforahaircut=(14.00)+(13.50)+(025.00)+(010.00) = 4.00 + 3.50 + 0 + 0=4.00+3.50+0+0 = 7.50=7.50 Therefore, the cost of services for a haircut is $7.50