Answer :

To find what percent 78 is of 156, you can follow these steps:

1. Identify the part and total:
- The part is the amount we are comparing to the total, which is 78.
- The total is the whole amount, which is 156.

2. Set up the formula to find the percentage:
- The formula to calculate the percentage is:
[tex]\[
\text{Percentage} = \left(\frac{\text{Part}}{\text{Total}}\right) \times 100
\][/tex]

3. Substitute the known values into the formula:
- Using the values, the formula becomes:
[tex]\[
\text{Percentage} = \left(\frac{78}{156}\right) \times 100
\][/tex]

4. Perform the division:
- First, divide 78 by 156. This is calculated as:
[tex]\[
\frac{78}{156} = 0.5
\][/tex]

5. Multiply by 100 to convert to percentage:
- Now, multiply the result by 100 to find the percentage:
[tex]\[
0.5 \times 100 = 50
\][/tex]

Therefore, 78 is 50% of 156.