Practice Questions for Arithmetic - Percentage

1. PE 3 - Percentage | Arithmetic - Percentage

The value of a machine depreciates at a rate of 16% per annum. If the price of a new machine is Rs. 15,625, then its value after 3 years will be

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2. PE 3 - Percentage | Arithmetic - Percentage

In an exhibition, 40% of the collection is from the sale of champaign bottles and rest is from the sale of wine bottles. Had 30 more wine bottles been sold, their contribution would have been 80%. If the number of wine bottles sold is thrice the number of champaign bottles sold, find the total number of champaign bottles sold.

(a)
4
(b)
7
(c)
6
(d)
8
(e)
5

3. PE 3 - Percentage | Arithmetic - Percentage

Sunita made 4 mistakes in an exam and obtained 75% marks. If she had attempted 6 more questions and made 2 mistakes from these 6 questions, then she would have obtained 85% marks. If all the questions carried equal marks and there was no negative marking for wrong answers, then how many questions were there in the exam?

(a)
36
(b)
35
(c)
40
(d)
50
(e)
None of these

4. PE 3 - Percentage | Arithmetic - Percentage

ABC ltd. is an IT company and places an order for ‘x’ computers. The manufacturer can produce a maximum of ‘y’ computers daily, out of which a% are rejected and cannot be delivered. How many days will the computer manufacturer take to complete the order of ABC ltd.?

(a)
$\frac{100 x}{y^{2} (100 - a)}$
(b)
$\frac{100 x}{y (100 - a)}$
(c)
$\frac{75 x}{y {(100 - a)}^{3}}$
(d)
$\frac{x}{y (100 - a)}$
(e)
$\frac{(100 - a) x}{100 y}$

5. PE 3 - Percentage | Arithmetic - Percentage

Dinesh, Prateek and Ankush go for a party in a restaurant. Dinesh has four times as many coins as Prateek and 9 more than Ankush. When Dinesh gives away 50% of his coins, Prateek and Ankush agree to split those coins up equally. Now, Ankush has twice as many coins as Prateek. How many coins did Prateek start with?

(a)
9
(b)
6
(c)
10
(d)
4
(e)
8

6. PE 3 - Percentage | Arithmetic - Percentage

At the end of every year, the value of a gold coin is 'c' percent more than that at the start of the year. If the value was 'k' dollars on January 1, 1992 and 'm' dollars on January 1, 1994, then in terms of 'm' and 'k', what was the value (in dollars) on January 1, 1995?

(a)
m + $\frac{1}{2}$ (m - k)
(b)
m + $\frac{1}{2} (\frac{m - k}{k}) m$
(c)
$m \sqrt{\frac{m}{k}}$
(d)
$\frac{m^{2}}{2 k}$

7. PE 3 - Percentage | Arithmetic - Percentage

For a road to be built in Alabama, the committee decided that each and every member of the town will give a fixed amount of money for the purpose. Thus, 75% of the amount needed was collected from the citizens of Alabama, which equaled $600 on an average. If it is known that people of Alabama represent 60% of the total population of the area that the road will serve and if the road committee has to raise exactly the amount needed for building the road, what should be the average donation from people of rest of the service area?

(a)
$200
(b)
$300
(c)
$400
(d)
$500
(e)
$600

8. PE 3 - Percentage | Arithmetic - Percentage

x% of y is z and (x + 20)% of y is equal to 3z. Value of y, when expressed in terms of z, is

(a)
2z
(b)
5z
(c)
10z
(d)
z + 10
(e)
None of these

9. PE 3 - Percentage | Arithmetic - Percentage

The cost of manufacturing an article is made up of components A, B, C and D, which have a ratio of 1 : 2 : 3 : 4, respectively. If there are respective changes in the costs of these four components as -10%, +20%, +30% and -40%, then what would be the percentage change in the cost of the article?

(a)
-6.11%
(b)
3.33%
(c)
-4%
(d)
+4%
(e)
0%

10. PE 3 - Percentage | Arithmetic - Percentage

A company regularly changes price of its laptops according to market demand. In January, they increased the price by X% and decrease it by X% in February. Due to it, the price of the laptop was decreased by Rs. 200 with respect to its price in January. Company did the same thing in March and April, first increasing the price by X% and then decreasing it by X%. The final price after whole cycle was Rs. 19,602. What is the original price of the laptop before January?

(a)
Rs. 19,778
(b)
Rs. 20,000
(c)
Rs. 20,166
(d)
Rs. 22,000
(e)
Rs. 22,250

PE 3 - Percentage | Arithmetic - Percentage

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