Question
The population of a town grows by 25% in the first year,
declines by 20% in the second year, and rises by 30% in the third year. What is the total percentage change in the population over 3 years?Solution
Let the initial population be 100. 1st year: Population after a 25% increase = 125. 2nd year: Population after a 20% decrease = 100. 3rd year: Population after a 30% increase = 130. Overall percentage change = (130 - 100) / 100 × 100 = 30%. The overall percentage change is an increase of 30%.
384, 357, 313, 252, 174, ?
168, 178, ?, 273, 400, 618, 963
480, 288, ?, 103.68, 62.208, 37.3248
840, 2520, 630, 3150, ?, 3675
What value should come in the place of (?) in the following number series?
1.5, 2.5, 4, 6, ?, 11.5
306, 272, 240, ?, 182, 156
What will come in place of the question mark (?) in the following series?
18, 25, 36, 49, 66, ?
380, ?, 360, 324, 260, 160
What will come in place of the question mark (?) in the following series?
25, 25, 5, 10, 2, ?
4097, ?, 4359, 4493, 4629, 4767
Relevant for Exams:
