SAT Math: Arithmetic

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.

Subscribe to Knowsys SAT & ACT Blog by Email