80%. Now grinding and cooking now selling, selling price is 10 yuan 9 grains, gross profit can reach 80%, profit is considerable. Stone grinding coarse grain corn cake is based on the traditional fine processing of coarse grains, the use of coarse grains in the form of fine grains, traditional formulas and modern formulas are reasonable, a variety of grains with the present grinding fine, retaining all the nutrients of the grains.