It depends on the line.
If you bet using just the point spread you spend $1.10 to win a dollar, Example = If you took a team whether they are the favorite or underdog, you would need to spend $22.00 to win $20.00
Now if you took the MONEL LINE The dog will give you better odds on your dollar since they are a DOG, Example +150, you will get $1.50 for every $1 you bet ( $20 bet and if the dog wins you get $30, so you will cash out a $50 ticket)
If you bet the favorite on the Money Line you have to put out more to win, like -150 you need to spend $1.50 to win $1... the same $20 bet will get you back roughly only $16, and wouuld cash out a $36 ticket.
Hope this helps,