GENERAL KNOWLEDGE

Detailed explanation-1: -Indian coinage went decimal on April 1, 1957, ten years after it gained Independence from the British. Though coins as units of monetary value have been in use for 500 years or so, India’s history of modern coinage is only about 200 years old.

Detailed explanation-2: -Aryabhata and other mathematicians of ancient India first adopted the decimal system of numbers and place value system writing numbers the way we do today.

Detailed explanation-3: -Russia converted to a decimal currency under Tsar Peter the Great in 1704, with the ruble being equal to 100 kopeks, thus making the Russian ruble the world’s first decimal currency.