Stella wants to save money to buy a new laptop. Every month she sets aside an increasing amount of money to save for the laptop. In her first month, Stella has $5 saved. In the second month, she has $10, and in the third month, she has $20 set aside for the laptop. If the pattern above continues, how much will Stella have after 6 months? A)$1,024 B)$256 C)$315 D)$635
C) $315