Final answer:
To convert 78% to a fraction, it is written as 78/100 and then simplified to 39/50 by dividing both the numerator and denominator by 2.
Step-by-step explanation:
To convert 78% to a fraction, you write 78% as 78/100. Since both 78 and 100 are divisible by 2, you can simplify the fraction by dividing both the numerator (top number) and the denominator (bottom number) by 2. Doing this, you get (78 ÷ 2)/(100 ÷ 2), which simplifies to 39/50.