One kilogram of cherries cost 4.29babu bought 4 kg the clerk charged babu 19.96 how did immediately know that clek had made a mistake?

4 kg of cherries = 4 x 4.29 = 17.16 babu.

Mistake identification:

Babu knew the price of 1 kg of cherries was 4.29 babu, and he bought 4 kg. So, the total cost should be around 4 x 4.29 = 17.16 babu. However, the clerk charged him 19.96 babu, which is significantly higher than the expected amount.

Realizing this discrepancy, Babu immediately recognized that the clerk had made a mistake in calculating the total cost.