Question
A town’s population increases by 10% in the first year and by 20% in the second year. If the population at the end of the second year is 39,600, find the population at the beginning of the first year.
Solution
Overall factor = 1.10 × 1.20 = 1.32 Let initial population = P P × 1.32 = 39,600 P = 39,600 / 1.32 1.32 = 132/100 P = 39,600 × 100 / 132 = 3,960,000 / 132 132 × 30,000 = 3,960,000 So P = 30,000 Answer: Initial population = 30,000.
More Percentage Questions
- Arun’s salary is first increased by 20% and then decreased by 25%. The result is the same as Varun’s salary increased by 40% and then reduced by 20%. Find ...
- The price of a laptop undergoes two consecutive changes over two months. In the first month, its price decreases by 10%, followed by an increase of 20% in ...
- The sum of the incomes of 'A' and 'B' is Rs. 40,000. If 'A' spends 80% of his income while 'B' spends 60% of his income, then the savings of 'B' will be Rs...
- Out of 520 students in school, 30% students like samosa only and 40% students like samosa and momos both. If 20% students don’t like any snacks then find t...
- In a colony, there are 30 APL families and 36 BPL families. Each APL and BPL family got blankets equal to 25% and 75%, respectively of total number of fami...
- 'V' sold 40% fewer candies than 'P' did. The ratio between the quantity of candies sold by 'V' and 'B' is 4:7. If 'B' sells 630 sweets, get the number of s...
- The sum of the monthly incomes of ‘A’, ‘B’ and ‘C’ is Rs. 50000 which is 4 times the monthly income of ‘C’. If ‘A’ spends 55% of his income while ‘B’ spend...
- Ritesh allocates 80% of his monthly income to expenses and saves Rs. 7000. Rishav, whose monthly income is 20% lower than Ritesh's, spends 75% of his incom...
- In an exam, Sunil scored 46% marks and failed by 65 marks whereas Anil scored 66% marks in the same exam and scored 45 marks more than the passing marks. F...
- Out of the total number of players, 100/3 % are in hotel X and the remaining are in hotel Y. If 20 players from hotel Y are shifted to hotel X, then the nu...
Relevant for Exams:
