## Percent Change

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?.

A. 41%

B. 71%

C. 73%

D. 74%

E. 77%

## Knowsys Method

**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.

**Want some help reviewing the math concepts you need to master? **Try out the Knowsys Pre-Algebra Flashcards, the Knowsys Algebra I Flashcards, and the Knowsys SAT & ACT Math Practice book.