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# need help with below question

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Manager
Joined: 28 Jun 2018
Posts: 147
Location: India
Concentration: Finance, Marketing
Schools: CUHK '21 (II)
GMAT 1: 650 Q49 V30
GPA: 4
need help with below question  [#permalink]

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24 Sep 2018, 02:43
Hi

Questions :
In Country C, the number of transactions made by various noncash methods in 2006 and 2009 are shown in the graphic. All other transactions were made with cash. (see the graph below)

If the total value of all credit card transactions in 2009 was 10% more than the total value of all credit card transactions in 2006, then the average (arithmetic mean) value of credit card transactions increased by ___________ % from 2006 to 2009.

1) 2.0
2) 17.4
3) 21.0
4) 22.0
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Manager
Joined: 23 Nov 2017
Posts: 107
Location: Singapore
Concentration: Strategy, Other
GMAT 1: 660 Q49 V33
Re: need help with below question  [#permalink]

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25 Sep 2018, 19:53
1
let the the average txns (2006) be s and txns (2009) be n.
Translating the prompt to an equation -If the total value of all credit card transactions in 2009 was 10% more than the total value of all credit card transactions in 2006, we get the below.
20n = 22s (110/100)
100n=121s
n/s = 121/100 =1.21

Calculating the increase in percentage;
(n/s - 1)100% = (1.21-1.00)100% = 21%

Hope this helps!!

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Re: need help with below question &nbs [#permalink] 25 Sep 2018, 19:53
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# need help with below question

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