A shopkeeper sells two types of articles A and B for the same price at Rs. 150/-. The cost prices of them are respectively Rs. 120/- and Rs. 200/-. On the first day he sells only one item of A and increases this number by 6 units each day. He sells 50 units of 13 on first day and decreases this number each day by 2 units. The number of days the shopkeeper incurs a net loss continuously is

Selling price of A and B are 150 Rs.

Cost price of A and B are 120 and 200 Rs.

profit on A=(150-120)=30 Rs. 

and Profit on B=(150-200)= -50 Rs(- means loss)

1st day:

Total loss=30×1-50×50=-2470 Rs.

2nd day:

Total loss=30×7-50×48=-2190 Rs.

3rd day:

Total loss=30×13-50×46=-1910 Rs.

4th day:

Total loss=30×19-50×44=-1630 Rs.

5th day:

Total loss=30×25-50×42=-1350 Rs.

6yh day:

Total loss=30×31-50×40=-1070 Rs.

7th day:

Total loss=30×37-50×38=-790 Rs.

8th day:

Total loss=30×43-50×36=-510 Rs.

9th day:

Total loss=30×49-50×34=-230 Rs.

10th day:

Total profit=30×55-50×32=50 Rs.

So, loss will continue for 9 days.

D is correct choice.