Percent Change & Percent Error

What is the correct Percent Change equation?

Percent of change = _____

Find the percent of increase.

Original: 32

New: 50

The price of a pair of shoes increases from $50 to $62. What is the percent increase?

(a)  

Jessie estimates the weight of her cat to be 8 pounds. The actual weight of the cat was 10 pounds. Find the percent error.

Snowfall for December was 4 inches, but in January it was 20 inches. This is a ____% increase from December to January.

A team of biologists used population sampling to determine that there are currently 350 chameleons living in a particular ecosystem. That same ecosystem had a population of 580 chameleons three years ago. Which is closest to the percent decrease in the chameleon population?

A group of wildlife conservationists are trying to determine what is causing a recent decrease in the number of white-tail deer in a particular area. Two years ago, they estimated the population to be 680. Recently, the population was estimated to be 410. Which is closest to the percent of change in the white-tail deer population?

Bees are responsible for the pollinaton that leads to the production of 1/3 of all our food. Sadly, the number of hives has declined drastically in recent years. In Central Texas, the number of hives has dropped from 276 to 125 in the last ten years. Which is closest to the percent decrease in the number of bee hives in central Texas?