The exchange rate between the US dollar and the Nigerian naira fluctuates constantly. To determine how much a $75 Amazon card is in naira, one needs to check the current exchange rate.

Banks and financial institutions usually offer different exchange rates. It's advisable to compare rates from multiple sources to get the best deal. When converting $75, the amount in naira will depend on whether it's a buying or selling rate.
Moreover, online currency exchange platforms also play a role. These platforms can provide real-time exchange rate information. By inputting the amount of $75, one can quickly find out approximately how many naira it would be equivalent to at that particular moment. So, the exact value of a $75 Amazon card in naira is subject to the prevailing exchange rate at the time of conversion.