Katie and Beth had the same number of marbles on January 1st. By the end of the year, Katie's collection of marbles increased by 25% and Beth's decreased by 75%. On December 31st, the number of marbles Beth owned was what percent of the number of marbles Katie owned?
Sometimes you can just pick an easy number to dealwith....like they both start with 100 marbles
at the end of the year Katie has 125 and Beth only has 25 25/125 x 100% = 25 %
x = number with which they each start.... 1.25 x is what Katie has and .25x is what Beth has at Y/E
.25x/1.25x * 100% = 25%