Sara makes $255 for working 15 hours and makes $680 for working 40 hours. What is the constant of proportionality (unit rate) of Sara's rate of pay per hour?
To find the constant of proportionality (unit rate) of Sara's rate of pay per hour, we need to divide the amount of money she earns by the number of hours she works for both scenarios:
For working 15 hours: 255 ÷ 15 = 17
For working 40 hours: 680 ÷ 40 = 17
So the constant of proportionality (unit rate) of Sara's rate of pay per hour is $17 per hour.