The exchange rate between the US dollar and the Nigerian naira fluctuates constantly. To determine how much a $100 Amazon gift card is in naira, one needs to check the current exchange rate.

Exchange rates are influenced by various factors such as economic conditions, market forces, and central bank policies. As a result, the value can change from day to day. You can find the most accurate exchange rate by checking financial news sources, online currency exchange platforms, or at local banks.
Once you have the current exchange rate, you simply multiply it by 100 to find out the equivalent amount in naira. For example, if the exchange rate is 1 dollar = 410 naira, then a $100 Amazon gift card would be worth 41,000 naira. However, it's important to note that this is just an estimate based on the given exchange rate and it can vary.