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Answered

Jennifer has been saving for college for 57 months. The first month, she saved $11.

She was able to save more money each month than the month before.

She ended up saving $19,779.00. How much more did she save each month?


A)$11

B)$11.50

C)$12

D)$12.50

Verified Answer :

1157+X(1+2+3+.....+56)
=1157+X(1+56)*56/2
=627+1596X
=19779

X=(19779-627)/1596=12
Your answer is C

meerkat18

we can translate the following statement into a1 equal to $11, n equal to 57, and s equal to $19799. The formula to be followed through derivation is 
s = (n/2) (a1 + a1 + d (n-1))$19799 = (57/2) * (2*11 + d*56)d = $12.01
The answer that is closest is option C

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