The number of smartphones sold by Company X increased from 150,000 in Q1 to 180,000 in Q2. What was the percentage increase in sales from Q1 to Q2?

✓ Correct Answer: Option B

Percentage increase = ((New Value - Old Value) / Old Value) * 100%. So, ((180,000 - 150,000) / 150,000) * 100% = (30,000 / 150,000) * 100% = (1/5) * 100% = 20%.