Associated Topics || Dr. Math Home || Search Dr. Math

### Percentage Increase in Cost of Eggs

```
Date: 8/4/96 at 21:2:21
From: Anonymous
Subject: Percentage Increase in Egg Cost

By what percent did the price of eggs increase from 1940 to 1950 if in
1940 the eggs cost 17 cents and in 1950 the eggs cost 39 cents??

I have no clue as to what steps you would take to solve this problem.
Could you help me?

Thanks so much :)
Lindsay
```

```
Date: 8/4/96 at 21:51:29
From: Doctor Paul
Subject: Re: Percentage Increase in Egg Cost

Well let's use common sense to estimate.  You should know that if the
price doubles that's a 100 percent increase.  So if it went from 17 to
34 it would be 100 percent.  So, by common sense, we can guess the

Let's continue:

Here's the formula for finding percent increase:

starting price * x = finishing price

solve for x:
subtract 1 from x, multiply that number by 100 and that's your percent
increase..

let's do it!

17*x = 39
x = 39/17
x = 2.29412
x-1 = 1.29412
multiply by 100:

129.412 percent

So our original estimate was off by a little, but was still fairly
close. You should learn the value of estimating!  It turns out to be
very useful.

I hope this answers your question.  Feel free to send Dr. Math any

Doctor Paul,  The Math Forum Check out our web site!
http://mathforum.org/dr.math/
```
Associated Topics:
Middle School Algebra
Middle School Fractions
Middle School Ratio and Proportion

Search the Dr. Math Library:

 Find items containing (put spaces between keywords):   Click only once for faster results: [ Choose "whole words" when searching for a word like age.] all keywords, in any order at least one, that exact phrase parts of words whole words

Submit your own question to Dr. Math
Math Forum Home || Math Library || Quick Reference || Math Forum Search