Question

Jackson saves $2 during Month 1. During each subsequent month, he plans to save 3 times the amount saved the previous month. After 9 months, how much money will he have saved in all?

A. $16,482
B. $18,386
C. $19,682
D. $20,464

Answer 1

D. 20,464

Answer 2

how did u get that @LieutenantGeneral , please write the formula for the series

Answer 3

i didn't my bro did

Answer 4

I get $13122 which is none of the above answers ???

Answer 5

my formula is
2 * 3 ^ (m-1) where m = month
so for
month = 1 2 3 .... 9
saving = 2 6 18 .... 13122

Answer 6

Same here which threw me off

Answer 7

2 -- month 1
2(3) = 6 -- month 2
6(3) = 18 -- month 3
18(3) = 54 -- month 4
54(3) = 162 -- month 5
162(3) = 486 -- month 6
486(3) = 1458 -- month 7
1458(3) = 4374 -- month 8
4374(3) = 13122 -- month 9

in total : 13122 + 4374 + 1458 + 486 + 162 + 54 + 18 + 6 + 2 = 19682 (C)

I am sure there is an easier way to do this, I just don't know it

Answer 8

you could probably use a geometric series formula to solve this

Answer 9

@texaschic101 u too good!

Answer 10

not really....there is an easier way...just not sure. What if the question asked for the 100th month ? I would be in trouble then...lol