We are given that Reginald answered = 78% questions.
Total questions in percentage form could be written as 100%.
Reginald answered = 78% so, Reginald answered didn't answer = 100-78 = 12%.
Now, we need to convert 12% into a fraction.
We know, a percentage represents out of 100. So, we need write 100 in the bottom of that number.
Therefore, 12% could be written as 12/100.
Now, we could reduce 12/100 into simplest fraction, by dividing by a common number in top and bottom.
12 and 100 both can be divided by 4.
Dividing 12 and 100 by 4, we get
[tex]\frac{\frac{12}{4} }{\frac{100}{4} } = \frac{3}{25}[/tex]
Therefore, 3/25 fractional part did he not answer correctly.
