a) 1,30 * 2 + 3,20 = 2,60 + 3,20 = 5,80
b) 1,10 * 3 + 1,30 = 3,30 + 1,30 = 4,60
c) 1,10 * 2 + 3,20 * 3 = 2,20 + 9,60 = 11,80
;)
