It took Alice three months to save up to buy new shoes. If she saved 10 dollars the first month and 30 more each month, how much did she have saved by the end of the third month? Give me reasons, before answering the question
The first month she saved 10 dollars. By the second month, she had 10 + 30 = 40 dollars saved. By the third month, she had 40 + 30 = 70 dollars saved. So the final answer is 70.