648x33.33/66.67 plus the answar to 648
then answar x10/90 plus the answar 1 with two
then answar2 x10/90 and then plus answar 3 with 2 and answar will be 1200

648 x 33.33/66.67 = 324 then 648+324=972
972 x 10/90 = 108 the 108+972= 1080
1080 x10/90 = 1200

1/10 means 10%
1/30 means 33.33%

we are going in revers mode there for the division ll be (100 - %age)