Answer:
180 of the televisions are in high definition
Explanation:
If you want to find the percentage of something, you change the percentage to a denominator of 100. In this case, you have 60% out of 300.
60% = 60/100
60/100 x 300/1
If we cancel out the zeroes then we get 6 x 30/1, which is 180
Hope this helps!