1. **State the problem:** A pack of cards costs 50 cents more than 3 dollars. You want to buy two packs and pay with a 10-dollar note. Find the change received. 2. **Convert all amounts to the same unit:** 3 dollars = 300 cents, 50 cents more means the pack costs $300 + 50 = 350$ cents. 3. **Calculate the cost of two packs:** $2 \times 350 = 700$ cents. 4. **Convert the payment to cents:** 10 dollars = 1000 cents. 5. **Calculate the change:** $1000 - 700 = 300$ cents. 6. **Answer:** The change received is 300 cents, which corresponds to option B.