missing data.
let the number of new CD's be x
so new collection = 30 - 2 + x = x + 28
percentage increase = (x+28)/30 * 100 %
Once you determined what the rest of the question is, continue ....
In 2011. Dagan had a collection of 30 music CDs. Since then they have given away 2 CDs and purchased new CDs. Since 2011. what has been the percent increase in the number of CDs in Dagan's collection?
1 answer