A bank has the following exchange rates: Bank buying rate for 1 = NRs. 141.64, Bank selling rate for 1 = NRs. 142.24. (a) Which rate will the bank use to exchange Nepalese rupees into American dollars

To exchange Nepalese rupees into American dollars, the bank's selling rate for dollars is used.
Bank selling rate = NRs. 142.24 per $1.

$\text{Amount in \$} = \frac{\text{Total NRs}}{\text{Bank selling rate}}$ $\text{Amount in \$} = \frac{7,96,544}{142.24}$ $\text{Amount in \$} = 5600$ The final answer is \boxed{\5600}$.

Original NRs spent = NRs. 7,96,544
Amount of $obtained =$5600 (from part b)

When the customer exchanges dollars back into Nepalese rupees, the bank buys dollars.
Original bank buying rate = NRs. 141.64 per $1. Devaluation of NRs = 0.3A devaluation of the Nepalese rupee means that$1 will now buy more Nepalese rupees.

$\text{New bank buying rate} = 142.06492 \text{ NRs per \$1}$

$\text{NRs received} = \text{Amount in \$} \times \text{New bank buying rate}$

Since the value is negative, it represents a loss.
The final answer is a loss of $\boxed{\text{NRs. } 980.48}$.