Question

buna ziua! ma puteți ajuta la ex 1?​

Answer 1

Răspuns:

Explicație pas cu pas:

x = suma initiala

x = 40x/100 + 60(x -40x/100)/100 +40x/100 -128

x  = 4x/10 +6/10*(100x-40x)/100 +4x/10 -128

x = 4x/10 +6/10(60/100) + 4x/10 -128

x = 4x/100 +36x/100 +4x/10 -128

100x =40x +36x +4x -12800

-116x = -128000

116x = 12800,   x = 8000

a) 40*8000/100 = 3200

(3200/8000)*100 = 0,4*100 = 40%  prima zi

b) 8000 -3200 = 4800

4800*60/100 = 2880  a doua zi