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x ------100%
x= 182 * 100/ 130 = 140 zł
140 zl - 70 %
x ----100%
x= 140 * 100 / 70 = 200 zl
a) Cena na początku wynosiła 200 zl.
200 zl - 100 %
182 zl - x%
x= 182*100 / 200 = 91 %
100 % - 91% = 9%
b) cena początkowa zmalała o 9 % ..
0,91x=182
x=200
b)182/200=0,91
cena spadła o 9%