Keyboard letters mixed up, enter key not working - early '11 MacBook Pro

Question

I have an early 2011 MacBook Pro. The keyboard randomly stopped functioning correctly, some keys didn't work at all and others would type in different symbols that I've never seen before. I reset the language it seems to have fixed most of the problems (5 keys weren't working but now they all are). The Enter key inserts a hyphen instead of its normal function and certain keys will still type in random letters. If I press shift and the ENTER key it now puts an underscore instead of a hyphen. The question mark slash button also puts a hyphen or an underscore, as does the original hyphen button. The  plus sign and equal sign button now puts a square bracket, etc. You get the idea. I have already reset the PRAM, but the problem still persists. Approximately how much would somethin© like this cost to ©ix (© replaced the f and ©©©© keys now). f and ©©© keys now.

Answer 1

Try using a usb or wireless keyboard to verify that your built-in keyboard needs repair/replacement.
I don't see how anyone here could give you a price for that, these are user/user help forums.  Take it to an Apple service facility.