What made him angry?

Lencho became angry when he counted the money. There were only seventy pesos in the envelope whereas Lencho had demanded a hundred pesos. The difference in the amount made him angry. He thought that the men in the post office had stolen his that money.

For more answers visit to website:
https://www.tiwariacademy.com/ncert-solutions/class-10/english/first-flight-chapter-1/