Whats the best thing to invent for money?

Hey im trying to invent something that will pay alot of money but will cost nothing to invent and sell. like whats something that people would be more then willing to buy if i invented it? I mean I summited an invention idea to this one company and they said it would cost about 30k so im trying now to think some... show more Hey im trying to invent something that will pay alot of money but will cost nothing to invent and sell. like whats something that people would be more then willing to buy if i invented it? I mean I summited an invention idea to this one company and they said it would cost about 30k so im trying now to think some what i could invent that people would want so badly that i wouldnt have to pay that much
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