Janil is researching "pay as you go" cell phone plans for his mother, who does not want to lock into a fixed,- term contract and has no need for data or text plans. Plan A charges 20 cents per minute for local calls and 40 cents per minute for long-distance calls in Canada. Plan B charges a flat rate of 35 cents per minute for calls anywhere in Canada. Both plans can be cancelled at any time with no penalty. Above what percentage would her usage need to be long-distance in order for Plan B to be the better choice for Janil's mother?