I need 7 songs Ep mixed & mastered

Am working on a 7 track Ep I would like to know how much it will cost to mix & master 7 EP tracks.I will also like to know how much you charge if your mixing and mastering just one track from scratch.planning to drop the EP by April or first week of May

Additional info:
I'm looking to hire a top pro who's worked on hit songs, and have the budget for that. I need the vocals tuned as well. I don't have a hard deadline for this. . The song has somewhere between 10 and 30 tracks recorded that need mixing. I'll need you to master it too if possible.