Question

4 is what percent of 5

Answer 1

Percents are always out of 100. So, set up a proportion:
\[\frac{ 4 }{ 5 } = \frac{ x }{ 100 }\]
Cross multiply and get:
\[400=5x\] Divide by 5 and we have our answer:
\[x=400/5=80\]

Answer 2

do you know how to calculate % ?
suppose you get X out of Y then the % of X is (X/Y)*100
\[X*100 \div Y\]

Answer 3

Say you got a 4 out of 5 on a quiz and you want to know what % you got, that's 4/5*100

Answer 4

4/5=0.8
0.8*100=80%