Question

Un magazin face o reducere de 10% la prod electrocasnice , astfel ca un frigider costa acum 1080 lei . Reducerea a fost de?

Answer 1

x-pretul initial

10% din x= 10/100 *x=  1/10 *x=  x/10 -reducerea

x-x/10=  (10x-x)/10=  9x/10

9x/10=1080

x=10*1080/9

x=10*120

x=1200

Answer 2

100%-10%=90%

90%...............1080
100%........... x lei

x=100x1080 :90
x=1200-pretul initial

1200-1080=120 reducera