How do you calculate the percentage error?

Isee the amount was $90.00 then reduced to $75.00 , what is the percent ?

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

Use the data on the dot plot to answer the question. how many people read for more than three hours last week? i'm on a unit test review