The Shopkeeper increased the price of a product by 25% so that customer finds it difficult to purchase the required amount. But somehow the customer managed to purchase only 70% of the required amount. What is the net difference in the expenditure on that product?

Correct Answer: None of these

Explanation:

                  Physics             Chemistry

Failed           35%                    45%

Passed         65%                    55%

Passed in both = 22% of total student

percentage of students who are passed in any of the physics or chemistry or both =(65+55) - 22 = 98%

So, the percentage of students who are failed in both = 2%

Therefore, total failed (in both subjects) students = 12 

Correct Answer: 140

Explanation:

x - 35 = 80x/100 

=> x = 175 

=> 4x/5 = 4x175/5 = 140.

Correct Answer: Rs.2,24,000

Explanation:

One-quarter of one-seventh = 1/4 x 1/7
= 1/28
Now, 1/28 of a land costs = Rs. 30,000
Thus, 8/35 of the land will cost = 30,000 x 28 x 4/15
= Rs. 2,24,000.

Correct Answer: 20

Explanation:

Let the rquired number be 'P'

According to the question,

$$\begin{gathered} 100 x P 100 = 20 \\ = > P = 20 x 100 100 = 20 \end{gathered}$$

Hence, 100 percent of the number 20 is 20.

 

Now, you can also try for

20 percent of what number is 100

$$\begin{gathered} 20 x P 100 = 100 \\ = > P = 100 x 100 20 = 500 \\ = > P = 500 \end{gathered}$$

Hence, 20 percent of the number 500 is 100.

Correct Answer: 100 & 4

Explanation:

Let the first number be x and the second number be y.

Given

5% of x = (25% of y) + y

=> 5x/100 = 5y/4

=> x = 25y ......(1)

and also given that, x - y = 96

=> x = 96 + y .....(2)

From (1)&(2)

25y = 96 + y

=> 24y = 96

=> y = 4

From (1)

x = 96 + 4 = 100

Hence, the numbers are 100 & 4.

Correct Answer: -99%

Explanation:

By mistake = x/10 

 

Actual value = x * 10 

 

% Change =  10 x - x 10 10 x × 100 = 99 100 × 100  = 99% (negative)

 

Since actual value is greater than the wrong value.

Correct Answer: 33.33%

Explanation:

% Decrease in Width =  50 150 x 100

 

= 33.33% 

Correct Answer: 400

Explanation:

1st day the girl read = 40%

2nd day she read = 34 %

Remaining percentage of book = 100% - (40% +34%) = 26%

But given last two days she read equal number of pages

=> Each day she read 26%/2 = 13%

Last day she read 52 pages = 13%

13% = 52

1% = 4

=> 100% = 400

Total pages in the book is 400.

Correct Answer: 180

Explanation:

Given total number of cows = k
Now, 1st son share = k/2
2nd son share = k/4
3rd son share = k/5
4th son share = 9

(k) + (k/4) + (k/5) + 9 = k
=> k - (19k/20) = 9
=> (20k-19k)/20 = 9
=> k = 180.

Correct Answer: 14.285 %

Explanation:

Total Items = 7
Discounted = 1
Percentage = 1/7 x 100
= 14.285%