the 20 blouses cost 120 each and you sell them 145 each, so you have 25 pesos profit in each blouse. you sold 16 pcs.. so 16 x 25 = 400
there are 4 remaining blouses, in order to have 480 you still need 80 pesos.. so 80/4 = 20
120 + 20= 140
you need to sell the remaining blouses for 140 pesos