1. The problem states that you bought 150 USD with 7500 dinar. We need to find out how many USD can be bought with 30000 dinar at the same rate. 2. First, find the exchange rate from dinar to USD. The rate is given by the formula: $$\text{Rate} = \frac{\text{USD}}{\text{Dinar}}$$ 3. Using the given values: $$\text{Rate} = \frac{150}{7500} = 0.02$$ This means 1 dinar buys 0.02 USD. 4. Now, to find how many USD can be bought with 30000 dinar, multiply the amount of dinar by the rate: $$\text{USD} = 30000 \times 0.02 = 600$$ 5. Therefore, with 30000 dinar, you can buy 600 USD at the same exchange rate.