you have decided to hire a dj for your upcoming block party. you have narrowed your choices down to two different djs. the first one charges a $40 down payment and $25 per hour. the second one charges a $25 down payment ans $30 per hour. when do these djs break even? who is cheaper if your party is only 2 hours long? who is cheaper if your party lasts 5 hours? how much cheaper?