1.
a)
100%+10%=110%
363:110%=330 lei
100%+10%=110%
330:110%=300 lei pret initial
b)363-300=63 lei
63:300=0,21=21%
2.
4 tractoare ............186 ore
1 tractor............ .....186x4=744 ore
60 tractoare ...........744 :60=12,4 ore adica 12 ore si 24 minute
0,4 ore= 0,4 ×60 =24 minute