Advertisements
Advertisements
Question
6400 workers were employed to construct a river bridge in four years. At the end of the first year, 25% workers were retrenched. At the end of the second year, 25% of those working at that time were retrenched. However, to complete the project in time, the number of workers was increased by 25% at the end of the third year. How many workers were working during the fourth year?
Advertisements
Solution
Number of workers = 6, 400
At the end of the first year, 25 % of the workers were retrenched.
∴ 25 % of 6, 400 = 1, 600
Number of workers at the end of the first year = 6, 400 - 1, 600 = 4, 800
At the end of the second year, 25 % of those working were retrenched.
∴ 25 % of 4, 800 = 1, 200
Number of workers at the end of the second year = 4, 800 - 1, 200 = 3, 600
At the end of the third year, 25 % of those working increased.
∴ 25 % of 3, 600 = 900
Number of workers at the end of the third year = 3, 600 + 900 = 4, 500
Thus, the number of workers during the fourth year was 4, 500.
RELATED QUESTIONS
The population of a place increased to 54000 in 2003 at a rate of 5% per annum Find the population in 2001.
The population of a place increased to 54,000 in 2003 at a rate of 5% per annum. what would be its population in 2005?
Compute the amount and the compound interest in the following by using the formulae when:
Principal = Rs 5000, Rate = 10 paise per rupee per annum, Time = 2 years
The population of a city is 125000. If the annual birth rate and death rate are 5.5% and 3.5% respectively, calculate the population of city after 3 years.
Jitendra set up a factory by investing Rs 2500000. During the first two successive years his profits were 5% and 10% respectively. If each year the profit was on previous year's capital, compute his total profit.
The value of a machine depreciates at the rate of 10% per annum. What will be its value 2 years hence, if the present value is Rs 100000? Also, find the total depreciation during this period.
Pritam bought a plot of land for Rs 640000. Its value is increasing by 5% of its previous value after every six months. What will be the value of the plot after 2 years?
The value of a machine depreciates at the rate of 10% per annum. It was purchased 3 years ago. If its present value is Rs 43740, find its purchase price.
Find the compound interest if the amount of a certain principal after two years is ₹ 4036.80 at the rate of 16 p.c.p.a.
The population of a town was decreasing every year due to migration, poverty and unemployment. The present population of the town is 6,31,680. Last year the migration was 4% and the year before last, it was 6%. What was the population two years ago?
