What percentage of the factory workers earn between Rs. 150 and Rs. 180?

Answer: Option B

Wages numbers of workers
120         12
140         26 - 12     =     14
160         34 - 26     =     8
180         40 - 34     =     6
200         50 - 40     =     10
∴Required percentage
= $$\frac{8}{50}$$ × 100 = 16%