Answer:
 (b)  $1450
Step-by-step explanation:
For her debt-to-credit ratio to be 25%, Gwen must reduce her credit accounts balance to 25% of her limits of $6740. That balance will be ...
 0.25 × $6740 = $1685
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To get her balance down to that amount, she must reduce it by ...
 $3135 -1685 = $1,450.00