How long would it take, approximately, for you to double your money if your investment earned, on average, a 30% return? (Round answer to 2 decimal places, e.g. 52.75.) 0 7.50 years. 30.00 years. 0 2.40 years. O 22.50 years. Debra, age 28, earns $4740 per month. Every month she saves $410. Additionally, she has $2520 in outstanding credit cards and makes a $210 monthly payment of these cards. What is Debra's approximate savings ratio? (Round answers to 2 decimal places, e.g. 52.75.) 6.05%. 13.08%. 8.65%. 4.43%