Income of Avin is 5/8 of the income of Bina. Avin's expenses are one-half of those of Bina, and Avin saves 40% of his income.What percentage of her income does Bina save?
As for everything else, so for a mathematical theory: beauty can be perceived but not explained.
Arthur Cayley
"The gaming of numbers is called maths.So participate in this wonderful game and explore in it,learn in it and enjoy in it.Then only you can pass in this wonderful game."