It would take 10 years for the given sum of money be doubled at the given simple interest rate.
Explanation:
A 10% interest would be added to the the principal amount after each year. So the interest would reach 100% i.e. equal to the principal amount in 10 years.
The Indian Army during World War I contributed a large number of divisions and independent brigades to the European, Mediterranean, Middle East and African theatres of war in World War I.