students are delling boxes of cookies for a school bake sale. Coustomers can buy mint thins, double chocolate, or short bread cookie.Rosalie sold 3boxes of mint, 2boxes of chocolate and 5 boxes of short bread for a total of $46.50. Jayden sold 1 box of mint, 3 boxes of chocolate, and 8 boxes of short bread for a total of $54. Angel sold 6 boxes of mint , 1 box of chocolate and 3 boxes of short bread for a total of $47.50. set up a systen of equations and solve to find the cost of each type of cookie.