GMAT Prep / Country's currency

[Blast]

Does anyone know how to get to the answer?

[Stuart@KaplanGMAT]

So, we want 2%(I) + avg(100 + 1%(I)).

Since average = sum of terms/# of terms,

2%(I) + (100 + 1%(I))/2

(2/100)I + 100/2 + (1/100)(I/2)

2I/100 + 50 + I/200

4I/200 + I/200 + 50

5I/200 + 50

I/40 + 50

choose (C)!

[lunarpower]

well done.

the principal challenge of this problem is the sheer length of the wording in the problem statement: there are just a ton of words crammed into a rather small amount of space.

when you parse something like this, you should try your best to break it down into smaller parts:
add 2 percent of one's annual income to the average (arithmetic mean) of 100 units of country R's currency and 1 percent of one's annual income.
this is somewhat difficult to do on gmat problems, because you don't have a pre-printed piece of paper on which you can simply block things off and underline things; you'll have to write this stuff out on the yellow pad with which you're supplied at the exam.