s1=1a*1b=1ab
s2=1.3a*0.7b=0.91ab
Зменшилася,
(S1-S2/S1)*100%=(1ab-0.91ab/1ab)*100%=(0.09/1)*100%=9%
Зменшилася на 9%
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s1=1a*1b=1ab
s2=1.3a*0.7b=0.91ab
Зменшилася,
(S1-S2/S1)*100%=(1ab-0.91ab/1ab)*100%=(0.09/1)*100%=9%
Зменшилася на 9%