SAT Math Question Help?

Question

The only ******** question i got wrong and it happened to be listed as an easy question:

Shows you a graph of price of coffee and asks "between which two consecutive years was there the greatest change in the price of coffee"

I chose between 1982 / 1983: changed from 3.50 to 4.25 or 21.4% inc

Answer: Between 1984/1985: changed from 4.75 to 3.75 or 21.1% dec

Could it be they just wanted the amount of change? ($1 as opp to $.75)

How do you distinguish between amount of change and percent change

if they ask a question like this?

Answer 1

If I were you I'd resolving it using the concret numbers, ( 3.50 - 4.25, 4.75 - 3.75) Because they, at least you writed,  didn't tell what refers the porcentage, but they putted '' CHANGED from '' the numbers''. So the porcentage could be the positive changed.

I don't have certanty. =]

ps: At a question that you answered about studying for SAT, Did you do all of that you mentioned? Did you bought all of that books?

Because I want follow you, you know many things. Please e-mail me. Thank you