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12*12=144
15,6*15,6=243,36
243,36 / 144 = 1,69
odp. wzrosło o 69%
12 *30/100 = 360/100 =3,6
12cm+3,6cm =15,6 cm
15,6cm*15,6cm=243,36
243,36/144 = 1,69
Pole zwiekszylo sie 1,69 razy