Question

A woman spends 30%of her monthly income on food. 40%remaining on clothes and 50%of the remaining she saves how much money does she save.....?

Answer 1

Suppose total income is X
30% of X is 0.3X.
Remaining is 0.7X.
now 40% of remaining is 0.4 * 0.7X = 0.28X.
So new remaining is 0.7X - 0.28X = 0.42X
50% of remaining (remaining is 0.42X) is 0.21X.

So, she saves 21% of her money.