Why is it in plural form? You can be either singular or plural, right?
आप is always grammatically plural, so हैं needed here, even if it's used to address a single person.
Paisa is like an Indian cent, a hundredth of a rupee, right? So the Hindi word for money is "cents", essentially?
According to Wikipedia though, the smallest denomination that's legal tender is 50 paise, ₹½, so I imagine 'money' is the much more frequently used meaning.
How can we use much for money??it is countable,much is used for liquid.am I correct?
Both actually - 'how much money' is fine; so is 'how much tea'; so is 'how much time'.