The percentage change in the cost of a hot dog is -20%.
To calculate the percent change in the cost of a hot dog, we can use the following formula:
percent change = (new price - old price) / old price * 100%
In this case, the old price is $2.50 and the new price is $2.00. Plugging these values into the formula, we get:
percent change = (2.00 - 2.50) / 2.50 * 100%
percent change = -0.50 / 2.50 * 100%
percent change = -20%
Therefore, the percent change in the cost of a hot dog is -20%.
The following question may be like this:
in 2000 hot dogs cost 2.50 and in 2015 hot dogs cost 2.00 what is the percent change in the cost of a hot dog?