Final answer:
Susan must talk to 125 customers to achieve her goal of 25 sales, based on her 20% closing rate.
Step-by-step explanation:
To find out how many customers Susan must talk to in order to reach her goal of 25 sales, we need to use her experience with a 20% closing rate. Since the closing rate is 20%, this means that for every 5 customers she talks to, she makes one sale (because 20% of 5 is 1). To achieve 25 sales, Susan would need to talk to 5 times as many customers, as each group of 5 customers results in one sale.
Thus, the calculation would be 25 sales × 5 customers per sale = 125 customers. So, Susan must talk to 125 customers to reach her goal of 25 sales.