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2014-05-21T21:34:08+03:00
X-pretul initial

10% din x= 10/100*x= 1/10*x= x/10-   1a scadere

x-x/10= (10x-x)/10= 9x/10-restul

10% din 9x/10= 10/100*9x/10= 1/10*9x/10= 9x/100- a2a scadere

9x/10-9x/100= (90x-9x)/100= 81x/100-noul rest

81x/100=324
x=100*324/81
x=100*4
x=400
2 4 2