1. **State the problem:** Vivian buys two tomatoes for 500 shillings each and sells them with a 7% profit. We need to find the profit amount. 2. **Calculate the total cost price:** The cost price for one tomato is 500 shillings. For two tomatoes, total cost price = $2 \times 500 = 1000$ shillings. 3. **Calculate the profit:** Profit percentage = 7%. Profit amount = $\frac{7}{100} \times 1000 = 70$ shillings. 4. **Conclusion:** Vivian makes a profit of 70 shillings when selling two tomatoes with a 7% profit margin.