(100+80)*3

The calculation for \((100 + 80) \times 3\) is as follows:

1. First, add 100 and 80: \[ 100 + 80 = 180 \]

2. Then, multiply the result by 3: \[ 180 \times 3 = 540 \]

So, \((100 + 80) \times 3 = 540\).