Select the correct answer. Use the given formula to find the sum of a series.

0,(1 - )

Sn =

Stella is setting aside increasing amounts of money each month to save for a new laptop. In the first month, Stella sets aside $5. In the

second month, she sets aside $10, and in the third month, she sets aside $20.

If the pattern above continues, what is the total amount of money Stella will have saved after 6 months?

o

$256

$315

$155

$160