a)
4320*1,045+(1045^30-1)/0,045 = 275410,32
b)
BW = 27541032/1,045^30 = 73534,56
c)
275410,32*1,045^28 = b*1,045*(1,045^28-1)/0,045
b= 16740,94
e)
275410,32*1,029^t = 16290*1,029*(1,029^t-1)/0,029
t= 23,57
e)
16290/(275410,32-16290) = 0,0629 = 6,29 %