The value of a machine depreciates at the rate of 20% per annum. It was purchased two years ago. If its present value is ₹ 40,000, for how much was it purchased?

The count of a certain breed of bacteria was found to increase at the rate of 4% per hour and then decrease by 2% per hour. Find the bacteria at the end of 2 hours if the count was 2,00,000 initially.

In an examination 95% of the candidates passed and 150 failed. The number of candidates who appeared in the examination is.

The population of a district is 327000, out of which 224000 are males. 65% of the population is literate. If 65% males are literate, then what percentage of females are literate?

The population of a district is 383000, out of which 221000 are males. 58% of the population is literate. If 58% males are literate, then what percentage of females are literate?

The population of a district is 357000, out of which 194000 are males. 47% of the population is literate. If 47% males are literate, then what percentage of females are literate?

Two years ago, the population of a city was 1,10,000. The population increased by 10% in the first year and decreased by 10% in the second year. Find the present population.

The population of a district is 368000, out of which 220000 are males. 62% of the population is literate. If 62% males are literate, then what percentage of females are literate?

The current population of a town is 14,680. It increases by 25% and 70% in two successive years but decreases by 20% in the third year. What is the population of the town at the end of the third year?

The population of a district is 335000, out of which 214000 are males. 31% of the population is literate. If 31% males are literate, then what percentage of females are literate?

What will be difference in population 3 years ago and 2 years ago of a town, whose current population is 110000 and which is increasing at a rate of 25% every year?