Question

why did Lencho say the raindrops were like 'new coins'?
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Answer 1

As raindrops would have helped in getting a better harvest, resulting in more prosperity, so Lencho compared them with new coins. Hey, Friend, It was because raindrops resembles as a new coins and lencho knows that by raindrops his production will be good and by selling his crops he will get coins.

Answer 2

As raindrops would have helped in getting a better harvest, resulting in more prosperity, so Lencho compared them with new coins