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Wzrosło o 16 punktów %
x-100%
16%z23%x=0,16*0,23x=0,0368x=3,68%x
To 3,68%
x-100%-pierwotna cena
podwyżka- x+10%x=x+0,1x=1,1x
x%*1,1=1
1,1x=1/1,1
x=0,9090909090909091≈0,9≈90%
o 90%
a)x+2≤3
x≤3-2
x≤1
b)x-3>5
x>5-3
x>2