Nightmare007 wrote:

Hi

sayantanc2k, Can you please tell me when to use increase of and when to use Increase in.

Sorry, This might sound basic.

Here, in the above question i chose C rather than choosing E.

Thank you.

leanhdung wrote:

Please explain why the increase in in C is wrong, but the increase of in E is right!

Many thanks!

DigitsnLetters wrote:

Has option C been ruled out because it's unidiomatic? Can you elaborate on 'increase in' vs 'increase of', and explain why 'increase of' is correct here? TIA.

umabharatigudipalli wrote:

Heseraj wrote:

The national debt per U.S. citizen rose sharply between 2004 and 2008, nearly

double as much as the previous four years.

(A) double as much as

(B) double

(C) doubling the increase in

(D) twice that of

(E) doubling the increase of

Question GMAT Experts:

Can the increase of in option E be compared to the verb rose in the original sentence?

Appreciate your explanation.

Take a hypothetical case:

Value at year 1 beginning = 100

Increase in year 1 = 10

Value at year 2 beginning = 110

Increase in year 2 = 12

Value at year 3 beginning = 122

Increase in year 3 = 14

Value at year 4 beginning = 136

Increase in year 4 = 16

Value at year 5 (current) beginning = 152[/u]

Increase in year 5 (current) = ??

Case I: Doubling the increase IN last 4 years --->

Meaning 1: The "increase" doubled IN last four years ("IN" is an adverb for the verb "double"). The increase was 10 four years ago. Thus this year the increase is 10 x 2 = 20. Thus value at year end 5 = 152 + 20 = 172.

Meaning 2: The "increase" IN last four years doubled ("IN last four years" is a prepositional phrase modifier for the noun "increase"). The increase IN last 4 years was = 10+12+14+16 = 52. Thus this year the increase is 52 x 2 = 104. Thus value at year end 5 = 152 + 104 = 256.

Thus there is an ambiguity in meaning if one uses "IN" (the increase could be 20 or 104 - not clear).

Case II: Doubling the increase OF last 4 years ---> The "increase" OF last four years doubled ("OF last four years" is a prepositional phrase modifier for the noun "increase"). The increase OF last four years is 10+12+14+16 = 52. Thus this year the increase is 52 x 2 = 104. Thus value at year end 5 = 152 + 104 = 256.

There is no ambuity in meaning. ("The increase doubled OF last four years" does not make sense.)

Hence OF is better than IN

in this case.