What's the Municipal code of the FRP Party with an area of 100?
CREATE TABLE "municipalities_of_midhordland" (
  "name" text,
  "innhabitants" real,
  "area" real,
  "mayor" text,
  "party" text,
  "municipal_code" real,
  "language_form" text
);
SELECT SUM("municipal_code") FROM "municipalities_of_midhordland" WHERE "party"='frp' AND "area"=100;