In 2002, a dozen eggs cost an average of $1.03. In 2012, the average price rose to $1.80 per dozen. By approximately what percent did the price of eggs increase?.
Read the question carefully. This question has to do with change.
Identify the bottom line. % change = ?
Assess your options. You could use a complicated formula for change that you learned in school, but for SAT questions like this, a simple formula will suffice. It doesn't matter whether the change is an increase or a decrease, all you need to do is divide the difference by the original.
Attack the problem.
The difference between these two prices: $1.80 - $1.03 = $0.73
The original price: $1.03
The percent increase:
This answer is the percent change (in this case an increase): .71 = 71% .
Loop back. The question asked for an approximate number, so you are justified in rounding.
The correct answer is (B).
This is a medium level question.