Acompany's stock was selling at $28 a share. a month later, it was selling at $21 a share. what is the percent decrease.

You can use the formula ...

... (percent change) = ((new amount) - (original amount))/(original amount) × 100%

Filling in the given information, this tells you ...

... (percent change) = ($21 -$28)/($28) × 100%

... = (-7/28) × 100%

... (percent change) = -25%

A negative percent change is a decrease, so the change in price is a ...

... 25% decrease

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