Question

from his salary John spends 15% on rent 20% on transport and 50% on groceries .if he saves rupees 1245 every month what is his monthly salary?

Answer 1

total salary=100%
money spent = (15%+20%+50%) i.e. 85%...
so remaining 15% is money left with him i.e. Rs1245...
15%=1245
1%=1245/15
=Rs83...
he spends 85% of his salary so money spent=Rs(85 x 83)=Rs 7055...
savings = Rs1245
total money john gets= Rs 8300

Answer 2

Answer:

Monthly salary of John is 8300 rupees

Step-by-step explanation:

Let salary of John be x rupees.

It is given,John spends 15% on rent.

So,for rent he spends 15% of x

$= \frac{15}{100} \times x \\ = \frac{3x}{20} \: rupees$

and John spends 20% on transport.

So,for transport he spends 20% of x

$= \frac{20}{100} \times x \\ = \frac{1}{5} \times x \\ = \frac{x}{5} \: rupees$

and John spends 50% on groceries.

For groceries,he spends 50% of x

$= \frac{50}{100} \times x \\ = \frac{x}{2} \: rupees$

So,total expenditure of John

$= ( \frac{3x}{20} + \frac{x}{5} + \frac{x}{2} ) \\ = \frac{3x + 4x + 10x}{20} \\ = \frac{17x}{20} \: rupees$

He saves (total money - total expenditure)

$= (x - \frac{17x}{20} ) \\ = \frac{20x - 17x}{20} \\ = \frac{3x}{20}$

It is given that he saves rupees 1245 every month.

According to question,

$\frac{3x}{20} = 1245 \\ 3x = 1245 \times 20 \\ x = \frac{1245 \times 20}{3} \\ x = 415 \times 20 \\ x = 8300$

So, Monthly salary of John is 8300 rupees.

Here applied formula,

$a\% \: of \: b = \frac{a}{100} \times b$

This is a problem of percentage.

Know more about percentage:

https://brainly.in/question/10002322

https://brainly.in/question/33820520

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