-81 is the answer.............
<h2>D. Geometric Sequence </h2>
For your question: "Khalid invests $500 in an account that earns 1.5% interest per year, compounded annually. Which of the following is
formed by the amount in his account from year to year?"
The geometric sequence is formed.
Answer:

Step-by-step explanation:
I'm not sure if this is what you meant, but if there was a 3-day fundraiser and they got 10 calls per hour. The answer would be 3x24=72. There are 72 hours in three days. 10x72=720. In 3 days the fundraiser was called 720 times.