Calculate the share percentage from a 20.0 rating with 90 HUTs.

To calculate the share percentage, you use the formula for share, which is derived from the ratings and the number of Households Using Television (HUTs). The share is calculated by taking the rating (in this case, 20.0) and dividing it by the HUTs expressed in thousands (in this case, 90 HUTs translate to 90,000 households because each rating point represents 1% of TV households).

The calculation can be represented as follows:

1. First, convert the rating to its equivalent in households:

20.0 rating means 20% of households are watching.

Therefore:

20% of 90 HUTs = 20/100 * 90 = 18.

2. To find the share percentage, you divide the number of viewers (in households, which is 18,000) by the total HUTs (90,000):

Share = (Number of households viewing the show)/(Total HUTs) = 18,000/90,000 = 0.20.

3. To express this in percentage terms:

Share Percentage = 0.20 * 100 = 20%.

This means the share from a