at the end of any year a car worth 5% less than what is was worth at the beginning of the year .If a car was bought for 10000dollars in january 2009 its value in decimber 2009 was

Iam pretty sure its a sorry if im wrong

If i think this is what your asking, he should look at the grams or pounds/ounces and compare the to their cost then max can identify which one is proportional and which is not ( i think xd)