(1)今年进货价为a(1-P%) 利润率为[a(1+m%)-a(1-P%)]/a(1-P%)=(m-p)/(100-P)
(2)去年进货价为x,则(b-x)/x=P%,则 x=b/(1+p%),今年售价与去年相同,为b(1+m%)/(1+P%),利润率为[b(1+m%)/(1+P%)-b]/b(1+m%)/(1+P%)=1-(1+P%)/(1+m%),
(1)今年进货价为a(1-P%) 利润率为[a(1+m%)-a(1-P%)]/a(1-P%)=(m-p)/(100-P)
(2)去年进货价为x,则(b-x)/x=P%,则 x=b/(1+p%),今年售价与去年相同,为b(1+m%)/(1+P%),利润率为[b(1+m%)/(1+P%)-b]/b(1+m%)/(1+P%)=1-(1+P%)/(1+m%),