You could buy 276 single markers, you can buy 28 packs of markers, or 3
boxes of marker because 1pack = 10 markers, 10 markers multiplied by 10
packs equals 100. So 1 box would have 100 markers in it and if you took 2
boxes you would be missing 76 markers, so you're better off getting 3
boxes and having 300 markers than being less by 76.
or
if packs and boxes cost the same then you can get either one 27
times: 27 * 10 = 270. Then you can get 6 singles to equal 276.
