Step 1: Start with the fraction 30/70.

Step 2: To convert a fraction into a percentage, divide the numerator by the denominator.

30 ÷ 70 = 0.4286

Step 3: Multiply the result by 100 to get the percentage.

0.4286 × 100 = 42.86%

Final Answer: 30/70 as a percentage is 42.86%.