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30 --- 100%
x --- 3%
x = 30*3 : 100 = 0.9
30 - 0.9 = 29,1 ( w przyblizeniu 29)
trzeba wplacic 29 zl.
b) 45zl.
45 --- 100%
x --- 3%
x = 45*3% : 100% = 9*3 : 20 = 1,7
45 - 1,7 = 43,3 ( w przblizeniu 43)
trzeba wplacic 43 zl.
c) 210zl.
210 --- 100%
x --- 3%
x = 210* 3% : 100% = 63 : 10 = 6,3
210 - 6,3 = 203,7 ( w przyblizeniu 204 )
d)225zl.
225 - 100%
x - 3%
x = 225*3 : 100 = 675 : 100 = 6,75
225 - 6,75 = 218,25 ( w przylizeniu 218 )
3%-30zl
x=100*30/3=1000zł
100%-x zl
3%-45zl
x=100*45/3=1500zl
100%-x zl
3%-210zl
x=100*210/3=7000zl
100%-x zl
3%-225zl
x=100*225/3=7500zl