Răspuns :
[100+x]/100 ·113=200
[100+x]/100=200/113
(100+x) x 113 =200 x 100
100 + x = 20000/ 113
x=20000/ 113 - 100
x=8700/113
x=76,99%
regula de trei simpla
113........100%
200.........x%, x=200x100/113=176,99%, deci 200 este mai mare decat 113 cu 76,99%
