What would be the maximum loss on a protective put and breakeven?

For example, if you bought 500 shares of stock at $10 and it is now trading at $15, so you write protective puts with a strike price of $13 and a premium of $0.75.

Would the maximum loss be:

((Current Stock price-strike price)+premium)*100* # of puts

((15-13)+0.75)*500 = 1375

OR

((Strike Price - Stock Purchase Price) + Premium Paid)*100*# of puts

((13-10)+0.75)*500 = 1875

Would the breakeven be:

(Purchase price + premium)*100*# of puts

((10)+ (0.75)) = $10.75 per share

OR

(Current stock price + premium)*100*# of puts

((15)+ (0.75)) = $15.75 per share