Question

What is the monthly earnings of a person if ge spends 80 percent of his salary, donates 70 percent of the remaining and is left with just rs 6510.

Answer 1

Let the earnings of person be x
He spends 80% of salary that means he uses 80% of salary for him and remaining 20% of salary he kept with him = 20/100 (x)
in that money he donates 70%
such that
donated money = 70/100 (20/100) (x)
remaining 30% of money = 6510
=> 30/100 (20/100) (x) = 6510
=> 6/100 (x) = 6510
=> x = 6510(100)/6
=> x = 108500

I hope that the answer is correct
pls mark it as brainliest answer

Answer 2

let the monthly earnings be = x

80 % spent = 80x / 100

remaining salary = x - (80x/100)

70% of the remaining donated =

{x - 80x/100 } *70 / 100

now the final equation becomes

x - {x - 80x}*70 - 80 x = 6510
------. ----. ----
100. 100. 100

x - 14x / 100 - 8x / 10 = 6510

6x / 100 = 6510

x = 6510 * 100 / 6

= 108500 rupees