jacoleking12 jacoleking12 17-10-2018 Mathematics contestada 10 pounds of walnuts cost $50. How much does 1 pound of walnuts cost? Find the constant of proportionality. Question 5 options: 50/10 = 5. One pound of walnuts costs $5. The constant of proportionality is 5. 10/50 = .2. One pound of walnuts costs $0.20. The constant of proportionality is 0.2. 10 * 50 = 500. One pound of walnuts costs $500. The constant or proportionality is 500. 10 * 1 = 10. One pound of walnuts costs $10. The constant or proportionality is 10.