In January, Mr Ong spent $1000 of his monthly salary and saved the rest. In February, he reduced his spending by 25% and his savings increased by 40% Find Mr Ong's monthly salary
Let's assume Mr Ong's monthly salary is S.
In January, Mr Ong spent $1000 of his monthly salary, so his savings were S - $1000.
In February, Mr Ong reduced his spending by 25%, which means he spent 100 - 25 = 75% of his salary.
This is equivalent to 75/100 x S = 0.75S.
His savings increased by 40%, so his new savings were S - $1000 + 40/100 x (S - $1000) = S - $1000 + 0.40S - $400.
This means his new savings are 1.4S - $1400.
Since his new savings in February are equal to 1.4S - $1400, we can conclude that 1.4S - $1400 = 0.75S.
Subtracting 0.75S from both sides of the equation, we get 1.4S - 0.75S = $1400.
Combining like terms, we get 0.65S = $1400.
Dividing both sides of the equation by 0.65, we get S = $2153.85.
Therefore, Mr Ong's monthly salary is $2153.85.