Final answer:
D'Andre deposits $20 per month into his savings. By starting to save money early in life, one can leverage the power of compound interest to grow their investments over time.
Step-by-step explanation:
The question involves a consistent savings plan, where D'Andre deposits the same amount of money each month. By the 4th month, he has $80 saved. To find out how much he deposits each month, we divide the total amount saved by the number of months. So, we calculate $80 divided by 4 months to get the monthly deposit amount.
$80 ÷ 4 months = $20 per month
D'Andre deposits $20 per month into his savings. Starting to save money early and consistently can take advantage of compound interest over time, as exemplified by the provided example of a $3,000 investment growing to $44,923 over 40 years with a 7% annual rate of return.