136 - 136x = 85 136-85 = 136x 51/136 = x = 0.375 multiply x by 100 to get percent change = 37.5%
136
The number 160
-37.5%
Original Price x .85 = 136 Original price = 136/.85 (If you are allowed to use a calculator, you are done here.) IF not, factor and cancel... 136X100/85 = 2x2x2x17x2x2x5x5/17x5 = 2x2x2x2x2x5 = 32 x 5 = 160 160
70%
0.85
85% decrease.
when does this go in effect
17/20
136%
Well, first you need to find out what the 100% number is. To do that you divide 85 by 5 (the lowest common denominator between 85% & 100%) and you get 17. Now you divide 136 by 17 and you get 8. Then, to get the 100% number, you multiply the 8 by 20 (because 20 times 5 (the lowest common denominator) is 100%) and you get 160, your answer. As a double check, calculate 15% of 160 and you get 24, the difference between 136 (85%) and 160 (100%).