Correct option is B
Given:
A labour gets Rs. 4800 for 16 days of work.
Formula Used:
Number of daysPayment for 16 days=Number of days xPayment for x days
Solution:
Let the number of days he should work to get Rs. 8400 be x.
164800=x8400
300=x8400
x = 3008400=28
So, the labour should work 28 days to get Rs. 8400.
Thus, the correct option is (b) 28