1. A shopper uses a department-store gift card to pay for 3 sweaters priced at $12 each. What is the change in the value of the gift card? 2. When her elevator was out of service, Debi walked down 21 flights of stairs. She stopped to rest after every 3 flights. How many times did Debi stop to rest? 3. Last week, Clay wrote 4 checks for $20 each from his checking account, withdrew another $30, and finally made a deposit of $96. What was the change in the balance of his account over the week?

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Q: 1. A shopper uses a department-store gift card to pay for 3 sweaters priced at $12 each. What is the…

A: Given that

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