Read and complete.(15 marks)

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Text:
Isabella is going on a school trip. She needs to bring $50 for the entrance fee, $10 for lunch, and $20 for a souvenir. How much money does Isabella need in total for her school trip?

To find the total amount of money Isabella needs for her school trip, we will add up the amounts needed for the entrance fee, lunch, and souvenir.

Step 1: Add the entrance fee ($50) with lunch cost ($10):
$50 + $10 = $60.

Step 2: Add the result from step 1 with the souvenir cost ($20):
$60 + $20 = $80.

Therefore, Isabella needs a total of $80 for her school trip.

Explanation:
To solve this problem, we first need to determine the cost of each item Isabella needs to bring, which are the entrance fee, lunch, and souvenir. The problem specifies that the entrance fee is $50, lunch is $10, and the souvenir is $20.

To find the total cost, we add the amounts together. In step 1, we add $50 and $10, which results in $60. In step 2, we add $60 and $20, which gives us a final answer of $80.

By following these steps and explaining each calculation, I hope you can understand how to find the total cost in a similar problem. Please let me know if you have any further questions!