CREATE TABLE table_28301 ("Shortscale comparison" TEXT, "Chuquet" TEXT, "Peletier" TEXT, "Systematics" TEXT, "Base 10" TEXT, "SI Prefix" TEXT)

Name the base 10 for shortscale comparison for billion
SELECT "Base 10" FROM table_28301 WHERE "Shortscale comparison" = 'Billion'
SELECT "Base 10" FROM "table_28301" WHERE "Shortscale comparison" = 'Billion'