A person saves 10% of his salary every month. If his salary increases by 12% and the expenditure increases by 10%, then what will be the change in his saving per month?

উত্তর দেখান ও ব্যাখ্যা

উত্তর: (B) 30% increase

ব্যাখ্যা

Salary 100, spending 90, saving 10. New salary 112, spending 99, saving 13: a 30% increase.