Mary paid 15% of her monthly salary towards an EMI. From the remaining salary. she paid 10% as Internet bill and 20% as rent. If after the mentioned expenses she was left with Rs. 24,990 /-, what was Mary's monthly salary ?

Mary paid 15% of her monthly salary towards an EMI. From the remaining salary. she paid 10% as Internet bill and 20% as rent. If after the mentioned expenses she was left with Rs. 24,990 /-, what was Mary's monthly salary ?
1). Rs.45,000/-
2). Rs.48,000/-
3). Rs.42,000-
4). Rs.36,000/-

Solution

Let Mary's monthly salary = Rs. $100x$

Money spent on EMI = $\frac{15}{100} \times 100x = 15x$

Amount left = $100x - 15x = 85x$

% amount left after paying internet bill and rent = $100 - (10 + 20) = 70 \%$

=> Amount left = $\frac{70}{100} \times 85x = 24,990$

=> $\frac{7 \times 17x}{2} = 24,990$

=> $x = \frac{24,990 \times 2}{7 \times 17}$

=> $x = 210 \times 2 = 420$

$\therefore$ Mary's monthly salary = $100 \times 42$ = Rs. $42,000$

Solution

Let Mary's monthly salary = Rs. $100x$

Money spent on EMI = $\frac{15}{100} \times 100x = 15x$

Amount left = $100x - 15x = 85x$

% amount left after paying internet bill and rent = $100 - (10 + 20) = 70 \%$

=> Amount left = $\frac{70}{100} \times 85x = 24,990$

=> $\frac{7 \times 17x}{2} = 24,990$

=> $x = \frac{24,990 \times 2}{7 \times 17}$

=> $x = 210 \times 2 = 420$

$\therefore$ Mary's monthly salary = $100 \times 42$ = Rs. $42,000$

Let the salary of marry be 100x

After paying 15% on emi she left with 

15/100*100x=15x

100x-15x=85x

Now she paid 10% on internet and 20% aa rent 

85x-85x*10%-85x*20%=24990

X=420

Salary =100*420=42000

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