Len and three of his friends decide to rent a house and split the cost evenly. they each paid $725 towards the total move-in cost of first month's rent, last month's rent, and a security deposit. if rent is $800 per month, how much was the security deposit?len and three of his friends decide to rent a house and split the cost evenly. they each paid $725 towards the total move-in cost of first month's rent, last month's rent, and a security deposit. if rent is $800 per month, how much was the security deposit?