The incorporated city of Orillia has asked PPP to make them $10,000$ commemorative pottery plates to celebrate their ${150}^{th}$ anniversary. These would cost the same as regular PPP plates to make. The price would be $$2\mathrm{.}50$ per plate. The contract would reduce PPP$\text{'}$s usual business by $10,000$ plates, as the company has no spare capacity PPP is concerned about the reported loss on the mugs they make. It is considering eliminating mugs. If mugs were discontinued, PPP would be able to make and sell an additional $10,000$ plates. The effect on operating profit would be

none of the options

an increase of $$20,000$

an increase of $$6,250$

a decrease of $$12,500$

a decrease of $$31,250$