Suppose the current spot rate is $1.29/€. What is your payoff if you purchase a down-and-in put option on the euro with a strike price of $1.31/€, a barrier of $1.25/€, and a maturity of 2 months?...

Suppose the current spot rate is $1.29/€. What is your payoff if you purchase a down-and-in put option on the euro with a strike price of $1.31/€, a barrier of $1.25/€, and a maturity of 2 months? When would someone want to do this?