Last school year, there were 540 students in 7th grade at our school. This year, there are 495 7th graders. Find the percent of change. State whether the change is an increase or decrease.

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer