Answer:
Total Amount in Barista's tip jar = $ 10 + $ 0.50n
Step-by-step explanation:
Barista makes an average of $ 0.50 from each customer
So, for n more customers, She will be having following amount in her tip jar:
Additional tip amount = $ 0.50 x n
Here the word "additional" is used, because she already had an amount of $ 10 in her tip jar.
Adding this amount to her additional tip amount, we will get following expression:
Total Amount in Barista's tip jar = $ 10 + ($ 0.50 x n)