(15*3+27)/9=8
15*(3+27)/9=50
90000/(500-50)*4=800
(90000/500-50)*4=520
90000/(500-50*4)=300
15*(3+27/9)=90
(15*3+27)/9=8
15*(3+27)/9=50
90000/(500-50)*4=800
(90000/500-50)*4=520
90000/(500-50*4)=300
15*(3+27/9)=90