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250+20%*250 =250 +20*250/100 =250+50 =300
2.
1min=60s
100%*12/60 =1200/60% =20%
3.
18%*240g =18*240/100 g=43,2g
4.
100%(24-15)/24 =100*9/24% =37,5%
5.
100%+15%=115%=1,15
46 :1,15 = 46*100/115 =40 kg
6.
30%*3kg =30*3/100 kg=0,9kg = 90dag
7.
100%+25%=125%=1,25
p wysokośc obniżki
1,25 -1,25p =1
-1,25p=1-1,25
p=-0,25/(-1,25)
p=0,2
p=0,2*100%
p=20%