College Math Placement Practice Test

To find the total sum when adding $30, $50, and $20, you simply add these three amounts together:

1. Start with the first two amounts:

\( 30 + 50 = 80 \)

2. Then, add the third amount:

\( 80 + 20 = 100 \)

Thus, the total sum is $100. The correct choice reflects the accurate total when all three amounts are added together.

The choice of $90 does not account for the full sum, which is why it is not the correct answer. Other options, while close in value, also do not reflect the correct calculation of the totals.