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P1=a²
b=1,4a po zwiększeniu o 40%
P2=(1,4a)²=1,96 a²
P2-P1=12
1,96 a²-a²=0,96 a²
0,96 a²=12 /;0,96
a²=12,5
1,4a*1,4a=p+12
a²=p
1,96p=12 /1,96
p=12.5