How to assign cost to a point?

I have used 'inpolygon' to find the points that are overlapped on a polygon. example: xv = [1 2 2 1 1 NaN 4 4 5 5 4 NaN 6 6 7 7 6];

yv = [0 0 3 3 0 NaN 1 2 2 1 1 NaN 4 5 5 4 4];

x = 1.5,2,9;

y = 3,7,8;

[in, on] = inpolygon(x, y, xv, yv)

Now i want to assign some cost values to the points that are overlapping the polygons. For example if a point has overlapped the polygon then the cost of that point is $30, if not then $10. Can it be done? Please help me with this question.