0
Q:

A Shopkeeper  charges sales tax of x% upto Rs.2,000 and above it he charges y%. A customer pays total tax of Rs 320, when he purchases the goods worth Rs. 6,000 and he pay's the total tax of Rs. 680 for the goods worth Rs. 12,000. The value of (x-y) is:

A) 0 B) -2
C) -4 D) 5

Answer:   B) -2

Explanation:

          \inline 2000\times \frac{x}{100}+4000\times \frac{y}{100}=320

and     \inline 2000\times \frac{x}{100}+10,000\times \frac{y}{100}=680

\therefore        x = 4  and  y = 6

\therefore         x-y = -2

Q:

In a competitive examination, the average marks for the entire examination was 60 marks. If 20% of the applicants scored 85 marks and 25% scored 95 marks. What was the average marks of the remaining applicants in the examination ?

A) 60 B) 52
C) 45 D) 35
 
Answer & Explanation Answer: D) 35

Explanation:

Let the total applicants be 100
Then, 20% got 85 marks

i.e 20  85 = 1700

and 25% got 95 marks

i.e 25  95 = 2375

Now, the remaining applicants are 55 and let the average marks scored by them be x.

 2375 + 1700 + 55 x  =  60  100

 6000 - 4075 = 55x
 55x=1925
 x= 
x=35.

 

 

Report Error

View Answer Workspace Report Error Discuss

5 17
Q:

A sales boy is allowed  % discount on the total sales made by him plus a bonus of % on the sales over Rs.12,000.If his total earnings were Rs.2400, then his total sales(in Rs.) are ?

A) Rs.60,145.23 B) Rs.54,285.54
C) Rs.52,147.85 D) Rs.50,589.47
 
Answer & Explanation Answer: D) Rs.50,589.47

Explanation:

Let the total earnings be Rs.x

Then % of x + % of (x-12,000) =2400

=>   +    =2400

=>  x=50,589.47

Report Error

View Answer Workspace Report Error Discuss

5 143
Q:

The population of a city is 415600.It increased by 25% in the first year and decreased by 30% in the second year.What is the population of the city at the end of second year?

Answer

As per given data, P = 415600, R1= 25% incresed, R2 = 30% decreased


Population of the city at the end of the second year= 



363650.

Report Error

View answer Workspace Report Error Discuss

9 115
Q:

The ratio of earnings of A and B is 4:5. If the earnings of A increase by 20% and the earnings of B decrease by 20%, the new ratio of their earnings becomes 6:5. What are A's earnings?

A) Rs.22,000 B) Rs.27,500
C) Rs. 26,400 D) Cannot be determined
 
Answer & Explanation Answer: D) Cannot be determined

Explanation:
Report Error

View Answer Workspace Report Error Discuss

57 2136
Q:

If the length of a rectangle is increased by 10% and the area is unchanged , then its corresponding breadth must be decreased by?

Answer

Suppose length = 100m and breadth = x m


Area = 100 m


New length = 110m and breadth = (x-y% of x)


Then, \inline 110\times (x-\frac{y}{100}x)=100\times x


\inline \Rightarrow \inline 110\times (1-\frac{y}{100})=100


\inline \Rightarrow \inline 1-\frac{y}{100}=\frac{100}{110}


\inline \Rightarrow \frac{y}{100}=1-\frac{100}{110}=\frac{1}{11}


\inline y=\frac{100}{11}=9\frac{1}{10}%

Report Error

View answer Workspace Report Error Discuss

52 2341