A alone can complete half of the work in 150 days. In 50 days, what percentage of the work will be completed by A?

16.67% 15% 20% 22.5%

16.67%

A completes half work in 150 days, Therefore, it takes him 300 days to complete the full work. Using unitary method, in 50 days the percentage of work that is completed is: $\frac{1}{300}$ x 50                    = $\frac{1}{6}$ or 16.67%