Yani mendapat uang saku 10.000 rupiah Kemuadian,Yani membelanjakan 2.500 rupiah.Berapa persen sisa uang sakunya?

uang saku 10.000 = (10.000/10.000) x100% =100%
dibelanjakan 2.500 artinya sisa uang 10.000-2.500 =7.500
sisa uang saku berapa persen ?
(7.500/10.000)x 100% = (75/100)x 100% >>>> disederhanakan dibgi 25)
                                     =[(75:25)/(100:25)] x 100%
                                      = (3/4) x 100%
                                      =75%