. Investment Economics-DPTTinh1 2 3 4 5 l l l 6 7 l l l l 8 l l l 9 l l l l 10 l l l l 11 l l l. 12 i = 1 n i = 1 n 13 l l l I Vxl = Q Xi P Xi + Q Li P Li + C + W + VAT 14 l l n i = 1 n i = 1 15 l l l l i = 1 n 16 l 17 l 18 v v v i = 1 n j =