Can you walk me through the solution of: Frank's laundry detergent is double concentrated and will wash 80 loads of laundry.  His detergent is usually $25.00 a bottle but they're having a sale.  If he buys 2 bottles, both bottles will drop to $20.00 a bottle.  How much does he spend, in cents, per load of laundry, if he buys 2 bottles of detergent?