Question

Pretul unui obiect este240 lei .Au loc doua reduceri consecutive de pret ,prima cu10% ,iar a doua cu5% . Aflati noul pret

Answer 1

$\frac{10}{100} din240= \frac{10*240}{100} = \frac{x2400}{100} simplificat cu 100=24 lei e prima reducere$
240-24=216 lei e pretul dupa prima reducere
$\frac{5}{100} din216= \frac{5*216}{100} = \frac{1080}{100} simplificat prin 100=10,8 lei e a doua reducere$
216-10,8=205,2 lqi e noul pret

Answer 2

[100-10]/100 ·240[lei]
⇒90/100·240[lei]
⇒90·240[lei]/100
⇒90·24[lei]/10
⇒9·24[lei]⇒216[lei]
⇒[100-5]/100·216[lei]
⇒95/100·216[lei]
⇒95·216[lei]/100
⇒19·216[lei]/20
⇒19·108[lei]/10
⇒19·54[lei]/5⇒1026[lei]/5=205,2[lei-noul pret];