A tractor dealor puts a markup of 31% on cost on a part for which it paid $420. Find (a) the seling price as a percent of cost, (b) the seling price, and (c) the markup. (a) The selling price as a percent of cost is K. (Type an integer or a decimal) (b) The seling price is 1 (phound to the nearest dollar.) (c) The makyp is 1 (Type an integer or a decimal)