Answer:
Explanation:
Chang earns 51 dollars per week from his part-time work, regardless of the number of books he sells. For each book he sells, he earns an additional dollar. If he sells b books in a week, he will earn an additional b dollars.
Therefore, the amount, A (in dollars), that Chang earns in a week if he sells b books can be calculated using the following formula:
A = 51 + b
This formula takes into account Chang's base pay of 51 dollars per week and the additional amount he earns for selling b books.