50•30:100

To solve the expression \(50 \cdot 30 \div 100\):

1. First, multiply \(50\) by \(30\): \[ 50 \cdot 30 = 1500 \]

2. Next, divide \(1500\) by \(100\): \[ 1500 \div 100 = 15 \]

Therefore, \(50 \cdot 30 \div 100 = 15\).