100 million is equal to
(a) 1 Crore
(b) 10 Lakhs
(c) 10 Crores
(d) 100 Crores

Hint: We solve this problem by converting the given number of the international number system to the Indian number system.
In the international system, we present commas for every three digits and in the Indian system, we keep the first comma after three digits, and after commas are kept after two digits.
We have the condition that there are 6 zeros after 1 in a million.

Complete step by step answer:
We are given that the number is 100 million.
We know that there are 6 zeros in 1 million.
By using the above condition we get the value of 100 million as
\[\Rightarrow x=100,000,000\]
We know that in the international system we present commas for every three digits and in the Indian system, we keep the first comma after three digits, and after commas are kept after two digits.
By converting the given number in the international system to the Indian system we get the number as
\[\Rightarrow x=1,00,00,00,000\]
We know that the representation of number in the Indian system is in the order from the left side as one, ten, hundred, thousand, ten thousand, lakh, ten lakh, crore, ten crores, and hundred crores
By using the above order we get the name of the given number as 10 crores.
Therefore, we can conclude that 100 million is equal to 10 crores
So, option (c) is the correct answer.

Note:
We need to note that in the conversion of the international system to the Indian system there is a change in the position of commas only but there will be a lot of changes in the naming of the number.
We need to remember the standard points that million has 6 zeros and the order of naming a number in the Indian system.
In the Indian system, the order of naming a number from the left side is given as one, ten, hundred, thousand, ten thousand, lakh, ten lakh, crore, ten crores, and hundred crores