Select the best real-world problem for the equation x − 130 = 20. Then solve the equation. A Alf spent $130 on a physics text and found that he had only $20 left after his purchase. How much money did he have before buying the book? B Dan spent $130 on a physics text and found that he had only $20 left after his purchase. How much did the book cost? C Chuck spent $130 on a physics text and found that he had only $20 left after his purchase. How much money did he have after buying the book? D Bob spent $20 on a physics text and found that he had only $130 left after his purchase. How much did the book cost if it was taxed at a rate of 7.5%? The value of x is .