What is the percent of change From 200 to 500

Is a currency whose value is tied to another currency, meaning that the exchange is fixed

Combined megan and kelly worked 60 hours.kelly worked twice as many hours as megan.how many hours did they each worked?

The spring the owner of a sporting good store decreases the price of winter gloves from $10 to $8 each increases the price of swimming goggles from $8 to $10 without doing the math you think the percent decrease in the price of the gloves the same as the percent increase of the goggles explain why or why not