### Cheap Gas Along Route 66 in Illinois

In 1932 the price of gas was `\$0.277` per gallon. On 06 February 2005, I paid `\$1.899` per gallon. The 2005 price is `585.6%` higher than the 1932 price. { current Scottsdale gas prices }

```   Compute the cost for 10 gallons of gas in 1932 compared to 2005.

1932 \$0.277 per gallon   ...   2005 \$1.899 per gallon

\$ 0.277                        \$ 1.899
x     10                       x     10
--------                       --------
\$  2.77                        \$ 18.99
```

If we do some rounding to the nearest whole numbers, the per-gallon price of gas in 1932 was about `\$3` compared to `\$19` in 2005. Earlier it was mentioned that this is a `585.6%` increase over the span of 73 years (2005 - 1932).

How did we compute the percentage change between the prices?

```   ((1.899 - 0.277) / 0.277) * 100

1.899
- 0.277
-------
1.622

(1.622 / 0.277) * 100

_
1.622 / 0.277 is equal to 5.8555

_
5.8555 rounded to three decimal places is 5.856

5.856 * 100 is equal to 585.6%
```

In other words, `\$1.899` is `585.6%` more than `\$0.277`.

##### Update: 13 May 2005]

The Spring 2005 semester ended with gas prices at approximately `\$2.29` which is `727%` higher than gas prices in 1932. `727%` is a large percentage increase, but when inflation is taken into consideration it may be today's gas prices that are "cheap." {GDT::MAT082::Bit:: Gas Prices--1932 Versus Mid-May 2005}

Creator: Gerald D. Thurman [gthurman@gmail.com]
Created: 07 February 2005