Explanation

Sales tax of 5% on the purchase of the item = 5% of 250

Sales tax of 4% on the purchase of the item = 4% of 250

Therefore, the difference in the item's purchase will be,

= 5% of 250 - 4% of 250

= 5/ 100 x 250 - 4 / 100 x 250 

= 12.5 - 10

= 2.5

Explanation

If the rate of tax is 10% on, salary, then the  monthly salary of a person who pays Rs. 4500 tax per month is  Rs. 15000

Let us assume that the income of the man is Rs. y.

We are given that he pays 10% of his income as income tax, i.e.

His income tax = Rs. 10/100 × y.

We are given that he pays Rs. 1500 as income tax.

1500 = 10/100 × y

 y = 1500 x 10 = 15000.

Explanation

0.0b% of a = x

x = 100a/b

Explanation

Net percentage increase in Population = (2.5 - 0.5) = 2% each year.

Let the Original Population of the town be 100.

Population of Town after 1 year = (100 + 2% of 100) = 102.

Population of the town after 2nd year = (102 + 2% of 102 ) = 104.04

Now, % increase in population = 4.04 / 100 ×100 = 4.04%

Explanation

20% of 30% of 20% is written as

20/100 * 30/100 * 20/100 = 12/1000

12/1000 * 850

= 10.2 Rs

ND27-5-2023

Explanation

Let us convert the given word expression into a numerical format by deriving each term and its operation.

The operation of multiplication or 'x' in words is 'times'.

Eight times of a number b is denoted by 8xb = 8b.

Ten times of a number c is denoted by 10xc = 10c.

The operation of subtraction is denoted by ' - '.

Since we are subtracting eight times the number b from ten times the number c, we will write the term 10c first and then place the operation sign (of subtraction), which is followed by the next term 10c.

Hence, the required expression is = 10c- 8b.

ND12_8_2023

Explanation

After 5 mins ..... 3 persons will get the rumor

After 10 mins .... 3x2 + 3 = 9 

 persons will get after 15 = 9x2 + 9 =27 

after 20 mins..... 27 x2 + 27 = 81 

Explanation

Explanation

Percentage of the applicant to a program were rejected = 80%

Percentage of the applicant to a program who were accepted would be =100%-80%                                                                    =20%

So, The ratio of the number accepted to the number rejected is given by = 20: 80

= 1 : 4

Explanation

Let’s A = 20

B = 50

The formula is : A + B + AB/100

Because, here, it is given that two numbers are 20% and 50% more than the 3rd number.

So,

20 + 50 + 20*50/100

= 70 + 1000/100

= 70 + 10

= 80

So, the answer is 80 %