Answer:
90%
Step-by-step explanation:
Let's denote the score he should get on the next test as "x".
[tex]\frac{55+78+84+93+x}{5}[/tex] = 80%
310 + x = 400%
x = 90%
So, Danilo should aim to score 90% on the next test in order to have an average of 80% across all five tests.