Alonso paid for repairs on his car, and 3 5 of the bill was for labor costs. How much was the total bill if the cost of the labor was $79. 50? Let b = the amount of the total bill. Which equation and solution is correct? Five-thirds b = 79. 50, and the total bill was $47. 70. Three-fifths (79. 50) = b, and the total bill was $127. 20. Five-thirds b = 79. 50, and the total bill was $212. 0. Three-fifths (b) = 79. 50, and the total bill was $132. 50.