A small store buys every week six 2-l bottles of milk at a price of $1.25 each. If at the end of the week a bottle has not been sold, the store returns it to the provider and receives 30 cents back. The probabilities that the number of 2-l bottles sold during a week is 0, 1, 2, 3, 4, 5, and 6 equal 0.05, 0.10, 0.10, 0.20, 0.20, 0.20, and 0.15, respectively. What is the expected weekly profit of the store if the bottles are sold at a price of $1.80?