Question

Решите номер 7 (а) номер 8 (а) ...........

Answer 1

7а
$B=Acdot(1+ frac{p}{100}) \ B=120cdot(1+ frac{20}{100})=120cdot(1+ 0.2)=120cdot1.2=144$

8a
$A=Bcdot(1- frac{p}{100}) \ A=120cdot(1- frac{15}{100})=120cdot(1- 0.15)=120cdot0.85=102$

Answer 2

спс