Amount

[gmattester]

What was the total amount of postage required to mail n letters?
(1) n = 10
(2) Each of the letters required at least $0.32 postage.

According to me ans shud be C but OA is E

[Stuart@KaplanGMAT]

What was the total amount of postage required to mail n letters?
(1) n = 10
(2) Each of the letters required at least $0.32 postage.

Total cost = price * quantity. Whenever a common formula applies, it's good to jot it down on your scrap paper. So, we need to know the number of letter and the price per letter.

(1) number of letters. Not what we're looking for: insufficient, eliminate (a) and (d).

(2) price >= 32. Not what we're looking for: insuffiicent, eliminiate (b).

Combined: we know the quantity, but not the price. We could determine that:

total cost >= 10 * 32

but an inequality isn't enough. Based on (2), the cost per letter could be 32 cents, but it also could be 32 dollars - or for all we know, the cost for each letter is different.

Even combined, not enough information: choose (e).

[gmattester]

What was the total amount of postage required to mail n letters?
(1) n = 10
(2) Each of the letters required at least $0.32 postage.

Total cost = price * quantity. Whenever a common formula applies, it's good to jot it down on your scrap paper. So, we need to know the number of letter and the price per letter.

(1) number of letters. Not what we're looking for: insufficient, eliminate (a) and (d).

(2) price >= 32. Not what we're looking for: insuffiicent, eliminiate (b).

Combined: we know the quantity, but not the price. We could determine that:

total cost >= 10 * 32

but an inequality isn't enough. Based on (2), the cost per letter could be 32 cents, but it also could be 32 dollars - or for all we know, the cost for each letter is different.

Even combined, not enough information: choose (e).

Thanks for explanation. I missed this "Atleast" word.
My bad...