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obnizono o 30% = 3/10
3/10 * 45 = 3/1 * 4,5 = 13,5 zl
cena bluzki po obnizce 45 - 13,5 = 31,5 zlotych
prostokat:
a = 7 cm
b = 6 cm
ob = 2 * 6 + 2 * 7 = 12 + 14 = 26 cm
ob kwadratu - 26 cm
a = 26 : 4 = 6,5 cm
p = 6,5 * 6,5 = 42,25 cm kwadratowych