9) If 40 students sit for an aptitude test and 8 of them failed, what percentage of them passed the test?
(A) 65%
(B) 70%
(C) 75%
(D) 80%
10) A man's new income is Rs. 8400 per month. Given that his original income was Rs. 7500 per month, find the percentage increase in his monthly income.
(A) 11%
(B) 12%
(C) 13%
(D) 14%
11) A tour guide earns commission by bringing tourists to patronise a certain handicraft shop. Given that the commission he receives is 3% of the total sales. Calculate his commission on a particular day when the 12 tourists he brought to the shop spent an average of Rs. 2500 each.
(A) Rs. 500
(B) Rs. 700
(C) Rs. 900
(D) Rs. 1000
12) If 10% is deducted from a bill, Rs. 585 remains to be paid. How much is the bill?
(A) Rs. 650
(B) Rs. 700
(C) Rs. 675
(D) Rs. 750
13) The enrollment in a certain secondary school was 450 in 1979. By 1980 the enrollment had increased by 16%. What was the enrollment in 1980?
(A) 512
(B) 518
(C) 522
(D) 525
14) 40 arithmetic questions, each carrying equal marks were given in a class test. A boy answered 25 questions correctly. What percentage was this? To pass a test a student must answer at least 45% of the questions correctly. Find the least number of correct answers needed to pass.
(A) 62.5%, 18
(B) 64.5%, 22
(C) 66.5%, 22
(D) 68.5%, 18
15) A fruit seller has 120 oranges. Given that he has 20% more apples than oranges and 40% less oranges than pears, find the number of apples and the number of pears the fruit seller has?
(A) 144, 200
(B) 148, 380
(C) 149, 220
(D) 140, 190
16) A boy scored 90 marks for his mathematics test. This was 20% more than what he had scored for the geography test. How much did he score in geography?
(A) 71 marks
(B) 73 marks
(C) 75 marks
(D) 78 marks