Răspuns:
Explicație pas cu pas:
a)
N = numarul de masini electrice comercializate in cei 4ani
primul an N/10
rest 9N/10
al doilea an 2/5 * 9N/10 = 18N/50
rest 9N/10 - 18N/50 = 45N/50 - 18N/50 = 27N/50
al treilea an 60/100 * 27N/50 = 162N/500
rest 27N/50 - 162N/500 = 270N/500 - 162N/500 = 108N/500
al patrulea an 54 = 108N/500
N = 54*500/108 = 250
b)
162*250/500 = 81 masini vandute in al treilea an
81 x 23000 = 1863000 euro