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# How many more unit squares have to be shaded in order to have one-fifth of this figure shaded?

(A) 3 (B) 2 (C) 1 (D) 4

There are a total of 80 square boxes in the figure. If we want one fifth shaded, we want $\large\frac{1}{5}$$\times 80 = 16\;$ shaded boxes.