In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'.
Everybody knows(1)/ that Bhutan is the most peaceful(2)/ of all other countries of the world.(3)/ No Error(4)
If a person's income increases from Rs. 10 lakhs per year to Rs. 11 lakhs per year and tax increases from Rs. 80,000 to Rs. 92,500 the marginal tax rate is