Final answer:
Marie's total investment in the bank's stocks over four years is $18,400. This is calculated by multiplying the annual investment of $4,600 by the number of years invested, which is four.
Step-by-step explanation:
The question asks for the total amount Marie invested in a bank's stocks over a four-year period. Marie invested $4,600 each year for four years. To calculate her total investment, we simply multiply the annual investment by the number of years:
Total Investment = Annual Investment × Number of Years
Total Investment = $4,600 × 4 = $18,400.
Note that the changing stock prices mentioned for each year are not relevant to the calculation of the total amount Marie invested unless the question specifically asks for the value of those investments at the end of the period.