A stock value doubles every 42 days. If the stocks start out with $5.00, what will the value of the stock be in 18 weeks?

A.) $125.00

B.) $15.00

C.) $30.00

D.) $40.00

We know that the stock value doubles every 42 days and that the stocks start out with $5.00.

We should find the value of the stock in 18 weeks. Let us denote this value with S.

One week has 7 days, so 18 weeks have: 18*7=126 days.

In order to find how many times the stocks value was doubled we should divide this number of days with 42: 126/42=3

So, after 18 weeks the value of the stock would be: 5->5*2-> (5*2) * 2=40

answer:

D.) $40.00