the number of households with vcrs in 1990 was about 87.5% of the number with vcrs in 1993. about how many households had vcrs in 1993? 1989 ~ 1 household1985 ~ 18 households1990 ~ 63 households1995 ~ 77 households

I think you answer is 
63/87.5=.72 
.72*100= 72 

Answer is about 72 million 

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.