Advertisements
Advertisements
प्रश्न
For an amount, explain why, a 20% increase followed by a 20% decrease is less than the original amount.
Advertisements
उत्तर
Let us assume the amount be Rs. 100
⇒ x% increase in amount = Amount + `x/100` × Amount
⇒ 20% increase in Rs. 100 = `100 + 20/100 xx 100`
= 100 + 20
= Rs. 120
⇒ x% decrease in amount = Amount – `x/100` × Amount
Now, 20% decrease in Rs. 120 = `120 - 20/100 xx 120`
= 120 – 24
= Rs. 96
Hence, decreased price is less than original amount.
APPEARS IN
संबंधित प्रश्न
On Sunday 845 people went to the Zoo. On Monday only 169 people went. What is the per cent decrease in the people visiting the zoo on Monday?
The population of a city decreased from 25,000 to 24,500. Find the percentage decrease.
Arun bought a car for ₹ 3,50,000. The next year, the price went upto ₹ 3,70,000. What was the percentage of price increase?
The number of illiterate persons in a country decreased from 150 lakhs to 100 lakhs in 10 years. What is the percentage of decrease?
In the year 2015 ticket to the world cup cricket match was ₹ 1,500. This year the price has been increased by 18%. What is the price of a ticket this year?
Radhika bought a car for Rs 2,50,000. Next year its price decreased by 10% and further next year it decreased by 12%. In the two years overall decrease per cent in the price of the car is ______.
15% increase in price of an article, which is Rs 1,620, is the increase of Rs ______.
2500 is greater than 500 by ______ %.
Four times a number is a ______ % increase in the number.
In 2007 – 08, the number of students appeared for Class X examination was 1,05,332 and in 2008 – 09, the number was 1,16,054. If 88,151 students pass the examination in 2007 – 08 and 103804 students in 2008 – 09. What is the increase or decrease in pass % in Class X result?
