Question

Who did lencho think has taken the money? What is irony situation

Answer 1

Lencho think that the rest of the money has been taken by post office officers.The irony in the situation is that Lencho calls the post office employesvas a bunch of crooks,while the post office employes has collected the money and send it to Lencho.

Answer 2

Lencho had asked for 100 pesos but he received only 70 pesos.He considers that the post office employees are a bunch of crooks.He thinks that they have taken the rest of the money.

The ending is ironical,the postmaster and his employees who contributed to collect 70 pesos to help Lencho are thought to be cheats by him.