Final answer:
Billy can buy the tools for 300 Afghanis with his $40.00 if the exchange rate is 1 US dollar = 70 Afghanis.
Step-by-step explanation:
The exchange rate between currencies determines how much of one currency can be exchanged for another. In this case, Billy wants to exchange $40.00 to Afghanis. To find out if he can buy the tools for 300 Afghanis, we need to know the exchange rate between US dollars and Afghanis.
Let's say the exchange rate is 1 US dollar = 70 Afghanis. In this case, Billy would receive 40 x 70 = 2800 Afghanis when he exchanges his dollars. Since 2800 Afghanis is greater than 300 Afghanis, Billy can buy the tools.
However, it's important to keep in mind that exchange rates can vary and may include fees or commissions. So it's always a good idea to check the current exchange rate and any additional costs before making a currency exchange.