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24 Sep 2018, 00:18
Kudos
Bookmarks
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
72% (01:59) correct
28%
(02:13)
wrong
based on 109
sessions
History
Date
Time
Result
Not Attempted Yet
A man saves $10 per month. In each of the next 24 months, he saved $10 more than he saved in the previous month. What is the total amount he saved during the two-year period?
(A) $ 1800
(B) $ 2400
(C) $ 3000
(D) $ 3600
(E) $ 4800
(A) $ 1800
(B) $ 2400
(C) $ 3000
(D) $ 3600
(E) $ 4800
24 Sep 2018, 00:49
Kudos
Bookmarks
Bunuel
In next 24 months he saved $ 10 more than he saved in previous month.
10...20....30.......40........50...........so on
10 ( 1 + 2 + 3 + 4 + 5 .............+24)
10( 25*12)
= 3000
The best answer is C.
27 Sep 2018, 08:49
Kudos
Bookmarks
Another aproach would be to use Arithmetic Progression (AP).
The Sum of an AP is given by \(= \frac{n}{2} (2a + (n-1)d)\)
\(= \frac{24}{2} (2*10 + (24-1)10)\)
\(= 12*(20+230)\)
\(= 3000\)
The Sum of an AP is given by \(= \frac{n}{2} (2a + (n-1)d)\)
\(= \frac{24}{2} (2*10 + (24-1)10)\)
\(= 12*(20+230)\)
\(= 3000\)
