Question

Craig likes to collect vinyl records but decided to sell a few. Last year he had 120 records in his collection. Now he has 100 records. What is the percent change and is it an increase or a decrease?

Answer 1

Salut/Hello!

Answer: 16,(6)% and it's a decrease

Explanation:
/ - fraction line

initial records = 120
after selling = 100
=> records sold = 120 - 100 = 20

We know that:
100% = 120/100 => 1% = 1.2/100
120 - 100 = 20

So we can find: 20 : 1.2 = 16,(6)%
Because 5% = 6 and 6 : 1.2 = 5%

So by knowing the amount of records sold and the percentage per record we divide them and find out the percentage of records sold.

I hope it'll be useful! :]