Iknow the 90 percent number so how do i find the 100 perent number

divide the known number by 0.9

for example if you know 9 is 90% of a number

 divide 9 by 0.9 which = 10

9 is 90% of 10

i would be happy to . most people on would also love to i'm sure. if you just want someone who has done algebra before and want a little more personal relationship than just begging strangers for , i can certainly be of service. i do have college myself so i might not be 24/7.