In an examination, a candidate secured 125 marks and failed by 15 marks. If the pass percentage was 35%, find the maximum marks.

In an objective type paper of 150 questions, John got 80% correct answers and Mohan got 64% correct answers.

(i) How many correct answers did each get ?

(ii) What percent is Mohan's correct answers to John's correct answers ?

The number 12,000 is first decreased by 25% and then increased by 25%. Find the resulting number.

The cost of an article is first increased by 20% and then decreased by 30%, find the percentage change in the cost of the article.