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%.
What will come in the place of question mark (?) in the given expression?
? = 90% of 25% of (40 × 200) + 300
30% of 40% of 120% of 3500 = ? × 63
`(256/6561)(1/4) = ?`
What will come in the place of question mark (?) in the given expression?
√144 X √324 + ? = 83 + 31 X √16
(34.88% of 699.79) + 40.030 × 17.88 of 11.86 + 16.21 =? + (7.22)²
72.5% of 400 – 23.25% of 1020 = 105% of ?
5.45% of 1854 – 37.5% of 1096 = ? – 48% of 630
800 + 900 X (3)-2 - ? = 25 X 60 ÷ 2
? = 6.25% of 240 + 252 + 172 – 16 × 17
1500 ÷ 15 + 1000 ÷ √100 + ? = 250 * 3
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